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Manhattan GMAT Online Marketing Associate
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Welcome to the Manhattan GMAT Blog feed within the GMAT Club forum. Read valuable information about the GMAT, practice questions, events and more. Check back or follow this thread to get updates every time a new post is made.
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Manhattan GMAT Online Marketing Associate
Joined: 14 Nov 2013
Posts: 69
Followers: 7

Kudos [?]: 13 [0], given: 0

### Show Tags

11 Dec 2013, 16:00
 FROM Manhattan GMAT Blog: GMAT Challenge Problem Showdown: December 9, 2013 We invite you to test your GMAT knowledge for a chance to win! Each week, we will post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for a free Manhattan GMAT Prep item. Tell your friends to get out their scrap paper and start solving!Here is this week’s problem:Can you find the most efficient way to solve this problem?Gita, Hussain, Inge, Jeong, Karen, and Leila are seated in a row of six chairs. How many seating arrangements are possible if Gita cannot sit next to Inge and Jeong must sit next to Leila?To see the answer choices, and to submit your answer, visit our Challenge Problem Showdown page on our site.Discuss this week’s problem with like-minded GMAT takers on our Facebook page.The weekly winner, drawn from among all the correct submissions, will receive One Year of Access to our Challenge Problem Archive, AND the OG Archer, AND Our Six Computer Adaptive Tests ($92 value). ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors _________________ http://manhattangmat.com Manhattan GMAT Online Marketing Associate Joined: 14 Nov 2013 Posts: 69 Followers: 7 Kudos [?]: 13 [0], given: 0 Re: Manhattan GMAT Blog [#permalink] ### Show Tags 11 Dec 2013, 16:00  FROM Manhattan GMAT Blog: News from the GMAC Summit (from the makers of the GMAT) Last Friday, I attended the biannual GMAC Summit, a special conference that the makers of the GMAT put on for test prep companies. I want to share various tidbits that you should know!Integrated Reasoning (IR) has existed long enough now that GMAC is starting to be able to draw some conclusions about the efficacy of the section. Dr. Lawrence Rudner, chief psychometrician of GMAC, is quite pleased with the section’s performance to date.Though they still need to collect more data to be sure, early results indicate that IR is actually a little bit better of a predictor of grades in business school than are the quant and verbal scores. It will still be a while before they can collect as solid / extensive data as they have for quant and verbal, but perhaps it will be the case that, eventually, IR will become the most important section! (Don’t worry: if you are applying right now, nothing has changed. Even if you aren’t planning to apply until next year, it’s unlikely that the importance of IR will change extensively by then.)There were no admissions officers in attendance, but we did hear from GMAC that they have heard that admissions consultants are starting to consider using IR as a tiebreak for borderline cases. For example, let’s say a school considers 680+ a strong score and 630 to 670 an average score. For the pool of 630 to 670 candidates (only a few of whom are likely to be admitted), one potential tiebreak is the IR score.If IR is not your thing, don’t worry: it’s unlikely that any school is making this tiebreak decision based solely on the IR score. After all, many different variables go into an application; they might also decide to use number of years of work experience, under-represented industries, or some other factor. If you do tend to perform well on IR, though, then bonus: that’s an extra mark in the plus column for you.Interestingly, US students are tending to do a bit better on IR than all other students. (This is also true for the Verbal section of the test, while non-US students tend to do better than US students on the quant section of the test.) A lot of people consider IR more of a quant section, but verbal is just as important. If quant is your strength, then you’ll feel that IR is testing verbal more, and vice versa.Scoring and TimingI have only one piece of info for you here, but it’s quite an important piece of data. As we were discussing the scoring algorithm, someone asked the age-old question: whether certain questions were “worth more” than others. Dr. Rudner indicated (as he always has in the past) that the earlier questions are not worth more than the later ones. He did, though, indicate something that we suspected but had never heard officially confirmed: “outlier” questions ultimately count less towards your score.What’s an outlier? Briefly, an outlier is a question for which your performance was unexpected. Read on to understand what this means.An outlier is always relative to your own performance. (Note: we’re also talking only about the questions that count towards your score; the experimentals don’t matter here.) Most of the questions you answer will be within a certain range of difficulty. As a general rule, you’ll answer more of the easier questions in your range correctly and you’ll answer more of the harder questions incorrectly. This is the expected behavior.There are two types of outliers:(1) easier questions that you get wrong(2) harder questions that you get rightIf you were mostly answering 70th percentile questions correctly but you answered a 50th percentile question incorrectly, then that question will ultimately count less towards your overall score.The Takeaway: don’t stress over missing a question that you think is easier (but note that you can’t let this happen too many times or those questions will no longer be outliers!)If, on the other hand, you were mostly answering 70th percentile questions correctly but you answered a 90th percentile question correctly, then that question will also ultimately count less towards your overall score.The Takeaway: don’t waste a bunch of time and mental energy trying to get a really hard (for you) question right.Now, some of you are thinking, “But what if I can get a lot of those really hard questions right? Then they won’t be outliers and they will help my score!”That’s true. But can you spot the problem with that line of thinking?If you were already capable of answering that level of question effectively and efficiently, you wouldn’t need to be spending extra time or thinking, “Oh, I really need to get these right!” You’d already know how to do them. Plus, spending extra time on a really hard (for you) question does not actually guarantee that you’re going to answer it correctly, so even if you do happen to get one right every once in a while, that question is going to end up being an outlier for you—and you’ll miss other, easier questions later in the section because you will have mismanaged your time.It gets even worse. Those easier errors are no longer outliers, because there are too many, so your entire score is pulled down. (And the farther down the overall score is pulled, the more the couple of harder questions that you got right turn into outliers, so they can’t help pull your score up!)What to do? What we’ve been telling you all along: maintain a steady performance throughout the test, neither rushing nor spending too much time, and letting go of a question when needed (everyone will need to do this!).The Quant Scoring ScaleSome of you may have noticed that the top quant score of 51 is now only the 97th percentile. We were wondering whether GMAC would add to the scoring scale (maybe including scores of 52 or 53) in order to provide more categories of rankings at the top of the scoring scale.They have no plans to do this. The top business schools have told them that any score of 48 (76th percentile) or higher is good enough for them; they don’t need to have additional levels of score discrimination at higher levels. Because they don’t need that info, they actually don’t even want GMAC to change those scoring scales. The schools already have their systems set up according to the current scales. In other words, if it ain’t broke, don’t fix it! (Have you heard that idiom before? Don’t worry—they won’t use it on the GMAT.)EnglishAfter the last Summit, 2 years ago, we reported that the test has been “scrubbing” out American idioms and constructions that are used only in the Americanized version of English. Dr. Rudner reaffirmed this information. He also indicated that OG13 still contains examples of Americanized English that will no longer appear on the real test—so if you speak British English, Australian English, Indian English, or any other form, and you see a practice problem that seems wrong from your English’s point of view (such as collective nouns, which are singular in American English but plural in British English), then don’t worry about learning that construction. They’ve pulled such constructions from the real test.Also, a note to American-centric students: they have started including certain details that might make you a little more uncomfortable (but your international counterparts have been dealing with such discomforts for years). For example, a math problem dealing with money might use pounds instead of dollars. Money is still money, but it’s always a bit easier when you’re reading about your own currency. A reading passage might talk about a historical figure who was very well known in Asia but not so well known in western countries; again, American-centric students have been benefiting from these kinds of subtle advantages for decades.That’s all I’ve got for you for now; let us know if you have any questions! ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors _________________ http://manhattangmat.com Manhattan GMAT Online Marketing Associate Joined: 14 Nov 2013 Posts: 69 Followers: 7 Kudos [?]: 13 [0], given: 0 Re: Manhattan GMAT Blog [#permalink] ### Show Tags 12 Dec 2013, 09:00  FROM Manhattan GMAT Blog: Manhattan Prep’s Oh What Fun! Celebration Wraps Up Today wraps up our “Oh What Fun!” celebration! Manhattan Prep’s first-ever 12-day holiday celebration was a great success and we hope that everyone got the chance to enjoy all of our exclusive promos, contests, and free study materials.If you’ve missed any of this year’s celebration, not to worry, we still have a few promotions going on. Our Black Friday Sale for$150 off all December GMAT classes ends December 15, 2013, with code “BLACKFRIDAY150.” There are still some spots open in our two December online classes, which you can sign up for hereand here. Located in NYC? Come join us in-person for our classes beginning on Dec. 14th and Dec. 15th.We’re also still offering a free download to our 1-year access GRE Challenge Problem Archive. Remember to enter the code “OWFGRECHALLENGE“ at checkout.To keep the giving going and the holiday spirit alive, we are very excited to share today’s final celebration! We will be collecting non-perishable food to be donated to New York’s City Harvest now through Dec. 20th. Our goal is to collect a minimum of 200 food items including but not limited to: canned goods, peanut butter, mac-n-cheese, cereal, soups, pastas, etc. We will also be collecting children’s toys to be donated to the Marine Toys for Tots Foundation. Our goal is to collect a minimum of 50 new/unwrapped toysto be distributed to needy children in NYC. Finally, we are also collecting warm clothing to be donated to New York Cares Coat Drive. Our goal is to collect a minimum of 50 new or gently used coats, sweaters and blankets to be distributed to New Yorkers in need. Donations may be made at 138 West 25th St, 7th Fl. New York, NY 10001. Let’s make this season brighter for our community and those in need.Lastly, be sure to check our Facebook page tomorrow, where we will officially announce this year’s “Oh What Fun!” winners of the free GMAT course and the $250 Amazon Gift Card.A big thank you to everyone in our social community who participated in this year’s “Oh What Fun!” festivities! Enjoy the remainder of the holiday season and best of luck with your studies! ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors _________________ http://manhattangmat.com Manhattan GMAT Online Marketing Associate Joined: 14 Nov 2013 Posts: 69 Followers: 7 Kudos [?]: 13 [0], given: 0 Re: Manhattan GMAT Blog [#permalink] ### Show Tags 14 Dec 2013, 07:00  FROM Manhattan GMAT Blog: Free GMAT Events This Week: December 15- December 21 Here are the free GMAT events we’re holding this week. All times are local unless otherwise specified.12/15/13- Online - Essay Writing Workshop presented by mbaMission- 8:00AM- 9:30PM (EST)12/15/13- Online- Free Trial Class- 7:00AM- 10:00AM (EST)12/16/13-New York, NY-MBA Admissions Myths Destroyed presented by mbaMission- 7:30PM- 9:00PM12/19/13- Online - MBA Admissions Myths Destroyed presented by mbaMission- 12:00PM- 1:30PM (EST)Looking for more free events? Check out our Free Events Listings Page. ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors _________________ http://manhattangmat.com Manhattan GMAT Online Marketing Associate Joined: 14 Nov 2013 Posts: 69 Followers: 7 Kudos [?]: 13 [0], given: 0 Re: Manhattan GMAT Blog [#permalink] ### Show Tags 16 Dec 2013, 09:00  FROM Manhattan GMAT Blog: mbaMission B-School Chart of the Week: November 2013 Social Currency Ranking We’ve invited mbaMission: MBA Admissions Consulting to share their Business School Charts of the Week. Here is their Chart for November 2013 Social Currency Ranking.Rankings come in all shapes and sizes, but can any ranking truly capture social cachet? For a different perspective on the value of an MBA, we turn to the New York Times society pages, where the editors select and profile promising couples. Each month, we dedicate one B-School Chart of the Week to tallying how alumni from top-ranked business schools are advancing their social currency ranking.Colder weather and holiday travel seem to have brought about a lull in the New York Times wedding announcements for November. Still, of the 124 total announcements last month, 19 included a business school mention.Several weddings featured MBA students specifically. For example, Nicholas Tangney, who is a managing director for Lorentzen & Stemoco and is studying for his MBA at New York University’s Stern School of Business, was married to Samantha Lee, a vice president and account manager for consumer products clients at DeVries Global. Similarly,Tracy Massel, a student at Harvard Business School, married Steven Melzer, the director of finance and operations strategy at Expeditionary Learning. Morgan Fauth, a first year at Georgetown’s McDonough School of Business who married research analyst Kevin Patrick Coleman, Jr., was also featured among the wedding announcements.Notably, Dartmouth Tuck, which has as yet kept a rather low profile in the society pages, gained two mentions last month, raising its year-to-date total from five to seven with the marriage of alumnus and strategy consultant Andrew Brown to Caroline Hockmeyer, and the marriage of alumna and merchandise planning manager Anne Snodgrass to Wharton MBA Zachary Dennett.Another notable November announcement, though not technically an MBA wedding, was that of Ira Millstein, an adjunct professor and co-chairman of the Millstein Center for Global Markets and Corporate Ownership at Columbia Business School, to former stock trader Susan Frame. Millstein is also a senior partner at Weil, Gotshal & Manges and the former chairman of both the Central Park Conservancy and the American Red Cross of Greater New York.With a total of approximately 1,284 wedding announcements since January, our year-to-date total of MBA mentions hits 260 this month. ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors _________________ http://manhattangmat.com Manhattan GMAT Online Marketing Associate Joined: 14 Nov 2013 Posts: 69 Followers: 7 Kudos [?]: 13 [0], given: 0 Re: Manhattan GMAT Blog [#permalink] ### Show Tags 16 Dec 2013, 10:00  FROM Manhattan GMAT Blog: GMAT Challenge Problem Showdown: December 16, 2013 We invite you to test your GMAT knowledge for a chance to win! Each week, we will post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for a free Manhattan GMAT Prep item. Tell your friends to get out their scrap paper and start solving!Here is this week’s problem:A set of n identical triangles with angle x° and two sides of length 1 is assembled to make a parallelogram (if n is even) or a trapezoid (if n is odd), as shown. Is the perimeter of the parallelogram or trapezoid less than 10?To see the answer choices, and to submit your answer, visit our Challenge Problem Showdown page on our site.Discuss this week’s problem with like-minded GMAT takers on our Facebook page.The weekly winner, drawn from among all the correct submissions, will receive One Year of Access to our Challenge Problem Archive, AND the OG Archer, AND Our Six Computer Adaptive Tests ($92 value).
ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors

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http://manhattangmat.com

Manhattan GMAT Online Marketing Associate
Joined: 14 Nov 2013
Posts: 69
Followers: 7

Kudos [?]: 13 [0], given: 0

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17 Dec 2013, 07:00
ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors

_________________

http://manhattangmat.com

Manhattan GMAT Online Marketing Associate
Joined: 14 Nov 2013
Posts: 69
Followers: 7

Kudos [?]: 13 [0], given: 0

### Show Tags

17 Dec 2013, 07:00
ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors

_________________

http://manhattangmat.com

Manhattan GMAT Online Marketing Associate
Joined: 14 Nov 2013
Posts: 69
Followers: 7

Kudos [?]: 13 [0], given: 0

### Show Tags

23 Dec 2013, 12:00
 FROM Manhattan GMAT Blog: GMAT Challenge Problem Showdown: December 23, 2013 We invite you to test your GMAT knowledge for a chance to win! Each week, we will post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for a free Manhattan GMAT Prep item. Tell your friends to get out their scrap paper and start solving!Here is this week’s problem:A pharmacy must purchase a set of n metal weights, each weighing an integer number of grams, such that all integer weights from 1 to 300 grams (inclusive) can be made with a combination of one or more of the weights. What is the minimum number of metal weights that the pharmacy must purchase?To see the answer choices, and to submit your answer, visit our Challenge Problem Showdown page on our site.Discuss this week’s problem with like-minded GMAT takers on our Facebook page.The weekly winner, drawn from among all the correct submissions, will receive One Year of Access to our Challenge Problem Archive, AND the OG Archer, AND Our Six Computer Adaptive Tests ($92 value). ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors _________________ http://manhattangmat.com Manhattan GMAT Online Marketing Associate Joined: 14 Nov 2013 Posts: 69 Followers: 7 Kudos [?]: 13 [0], given: 0 Re: Manhattan GMAT Blog [#permalink] ### Show Tags 23 Dec 2013, 12:00  FROM Manhattan GMAT Blog: The 4 Math Strategies Everyone Must Master, Part 1 We need to know a lot of different facts, rules, formulas, and techniques for the quant portion of the test, but there are 4 math strategies that can be used over and over again, across any type of math—algebra, geometry, word problems, and so on.Do you know what they are?Try this GMATPrep® problem and then we’ll talk about the first of the four strategies.* ” If mv < pv < 0, is v > 0?“(1) m < p“(2) m < 0”All set?How did you do the problem? Most quant questions have more than one possible approach and this one is no exception—but I want to use this problem to talk about a particular technique called Testing Cases.This question is called a “theory” question: there are just variables, no real numbers, and the answer depends on some characteristic of a category of numbers, not a specific number or set of numbers. When we have these kinds of questions, we can use theory to solve—but that can get very confusing very quickly. Instead, try testing real numbers to “prove” the theory to yourself.(Note: I chose a particularly tough question for this exercise; testing cases can also be useful and fast on easier questions!)This problem gives one inequality:“mv < pv < 0″The test writers are hoping that you’ll say, “Oh, let’s just divide by v to get rid of it, so the equation is really m < p < 0.” But that’s a trap! Why?When you divide an inequality by a negative, you have to flip the signs. But you don’t know whether v is positive or negative, so you don’t know whether to flip the signs! Never divide an inequality by a variable if you don’t know the sign of the variable.The question itself contains a clue (two, actually!) pointing to this trap. The given inequality asks about “< 0” and the question also asks whether v > 0? Less than zero and greater than zero are code for “I’m testing you on positives and negatives.”So, we can’t actually simplify that annoying inequality. Things are going to get a little messy, but can you figure anything out to start? Glance at that starting inequality for a second: what can’t the value be? None of the variables can be 0, or the inequality mv < pv < 0 would be false.Do you want to start with statement 1 or statement 2? Since I’m writing this, I get to choose (I want to start with statement 2), but there isn’t one right answer to that question. Start wherever you want!“(2) m < 0”Hmm, m is negative. Call that -1. Then v could be -1… oh, wait, no v can’t be negative. Then mv would be positive but mv is supposed to be less than 0. And I already said v can’t be 0. If m is negative, then the only way to make mv negative is to make v positive. Cool!I’ve just proven the theory to myself by using a concrete number: I want mv to be negative. A negative times a positive equals a negative. If m is negative, then v has to be positive.Statement 2 is sufficient. Cross off answers ACE.“(1) m < p”(This one gets messy: I suggest you write down the steps yourself as we go.)Case #1: positive / positive.Case #2: negative / negative.Case #3: negative / positive.The only scenario that worked was case #2, and the only values for v that worked were positive. Therefore, v is greater than zero; the statement is sufficient.The correct answer is (D).As I mentioned earlier, the Testing Cases strategy can be used to make the work faster on lots of easier problems as well. In the case of these annoying theory questions, Testing Cases can really save us by making it (somewhat) easier to figure out what’s going on with the theory.For Strategy #2, I’m going to send you to an article I wrote a long time ago: How to Turn Algebra into Arithmetic. (We officially call this strategy Choose Smart Numbers.)This classic Problem Solving (PS) strategy has been around since the beginning of time (well, Standardized Test Time, anyway). It will work only on Problem Solving questions, not Data Sufficiency, but it is based on a similar principle: pick some real numbers to turn annoying algebra / variables / abstract math into a much more concrete problem.One main difference exists between the two strategies discussed so far. When choosing smart numbers, you will only have to test one set of numbers in the problem. When testing cases on theory problems, you will almost certainly have to test multiple sets of numbers (as we did in the problem above).Okay, begin! I’ll start you out with a couple of easier ones from OG13. Note: always learn new techniques on easier problems first! You might not even choose to use the special technique on this problem during the real test, but that’s the point: you’ll learn how to use the technique more easily when you already understand how the textbook math works.Test Cases: PS #32, PS #44, DS #1, DS #7Choose Smart Numbers: PS #34, PS #38Start thinking about how to recognize when you can use these strategies (how do you know?), and then practice them in different scenarios and across different content categories. Eventually, you will master these 2 essential techniques!Finally, don’t forget to join me next time, when we’ll discuss the other 2 essential quant techniques that everyone must master.* GMATPrep® questions courtesy of the Graduate Management Admissions Council. Usage of this question does not imply endorsement by GMAC. ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors _________________ http://manhattangmat.com Manhattan GMAT Online Marketing Associate Joined: 14 Nov 2013 Posts: 69 Followers: 7 Kudos [?]: 13 [0], given: 0 Re: Manhattan GMAT Blog [#permalink] ### Show Tags 30 Dec 2013, 10:00  FROM Manhattan GMAT Blog: The 4 Math Strategies Everyone Must Master, part 2 Last time, we talked about the first 2 of 4 quant strategies that everyone must master: Test Cases and Choose Smart Numbers.Today, we’re going to cover the 3rd and 4th strategies. First up, we have Work Backwards. Let’s try a problem first: open up your Official Guide, 13th edition (OG13), and try problem solving #15 on page 192. (Give yourself about 2 minutes.)I found this one by popping open my copy of OG13 and looking for a certain characteristic that meant I knew I could use the Work Backwards technique. Can you figure out how I knew, with just a quick glance, that this problem qualified for the Work Backwards strategy? (I’ll tell you at the end of the solution.)For copyright reasons, I can’t reproduce the entire problem, but here’s a summary: John spends 1/2 his money on fruits and vegetables, 1/3 on meat, and 1/10 on treats from the bakery. He also spends$6 on candy. By the time he’s done, he’s spent all his money. The problem asks how much money he started out with in the first place.Here are the answer choices:“(A) $60“(B)$80“(C) $90“(D)$120“(E) $180”Work Backwards literally means to start with the answers and do all of the math in the reverse order described in the problem. You’re essentially plugging the answers into the problem to see which one works. This strategy is very closely tied to the first two we discussed last time—except, in this instance, you’re not picking your own numbers. Instead, you’re using the numbers given in the answers.In general, when using this technique, start with answer (B) or (D), your choice. If one looks like an easier number, start there. If (C) looks a lot easier than (B) or (D), start with (C) instead.This time, the numbers are all equally “hard,” so start with answer (B). Here’s what you’re going to do:(B)$80 F + V (1/2)M (1/3)B (1/10)C $6Add?(B)$80$40…?$6Set up a table to calculate each piece. If John starts with $80, then he spends$40 on fruits and vegetables. He spends… wait a second! $80 doesn’t go into 1/3 in a way that would give a dollar-and-cents amount. It would be$26.66666 repeating forever. This can’t be the right answer!Interesting. Cross off answer (B), and glance at the other answers. They’re all divisible by 3, so we can’t cross off any others for this same reason.Try answer (D) next. F + V (1/2)M (1/3)B (1/10)C $6Add to?(B)$80$40…?$6?(D) $120$60$40$12$6$118 In order for (D) to be the correct answer, the individual calculations would have to add back up to $120, but they don’t. They add up to$118.Okay, so (D) isn’t the correct answer either. Now what? Think about what you know so far. Answer (D) didn’t work, but the calculations also fell short—$118 wasn’t large enough to reach the starting point. As a result, try a smaller starting point next. F + V (1/2)M (1/3)B (1/10)C$6Add?(B) $80$40…?$6?(D)$120$60$40$12$6$118(C)$90$45$30$9$6$90 It’s a match! The correct answer is (C).Now, why would you want to do the problem this way, instead of the “straightforward,” normal math way? The textbook math solution on this one involves finding common denominators for three fractions—somewhat annoying but not horribly so. If you dislike manipulating fractions, or know that you’re more likely to make mistakes with that kind of math, then you may prefer to work backwards.Note, though, that the above problem is a lower-numbered problem. On harder problems, this Work Backwards technique can become far easier than the textbook math. Try PS #203 in OG13. I would far rather Work Backwards on this problem than do the textbook math!So, have you figured out how to tell, at a glance, that a problem might qualify for this strategy?It has to do with the form of the answer choices. First, they need to be numeric. Second, the numbers should be what we consider “easy” numbers. These could be integers similar to the ones we saw in the above two problems. They could also be smaller “easy” fractions, such as 1/2, 1/3, 3/2, and so on.Further, the question should ask about a single variable or unknown. If it asks for x, or for the amount of money that John had to start, then Work Backwards may be a great solution technique. If, on the other hand, the problem asks for x – y, or some other combination of unknowns, then the technique may not work as well.(Drumroll, please) We’re now up to our fourth, and final, Quant Strategy that Everyone Must Master. Any guesses as to what it is? Try this GMATPrep© problem.“In the figure above, the radius of the circle with center O is 1 and BC = 1. What is the area of triangular region ABC?If the radius is 1, then the bottom line (the hypotenuse) of the triangle is 2. If you drop a line from point B to that bottom line, or base, you’ll have a height and can calculate the area of the triangle, since A = (1/2)bh.You don’t know what that height is, yet, but you do know that it’s smaller than the length of BC. If BC were the height of the triangle, then the area would be A = (1/2)(2)(1) = 1. Because the height is smaller than BC, the area has to be smaller than 1. Eliminate answers (C), (D), and (E).Now, decide whether you want to go through the effort of figuring out that height, so that you can calculate the precise area, or whether you’re fine with guessing between 2 answer choices. (Remember, unless you’re going for a top score on quant, you only have to answer about 60% of the questions correctly, so a 50/50 guess with about 30 seconds’ worth of work may be your best strategic move at this point on the test!)The technique we just used to narrow down the answers is one I’m sure you’ve used before: Estimation. Everybody already knows to estimate when the problem asks you for an approximate answer. When else can (and should) you estimate?Glance at the answers. Notice anything? They can be divided into 3 “categories” of numbers: less than 1, 1, and greater than 1.Whenever you have a division like this (greater or less than 1, positive or negative, really big vs. really small), then you can estimate to get rid of some answers. In many cases, you can get rid of 3 and sometimes even all 4 wrong answers. Given the annoyingly complicated math that sometimes needs to take place in order to get to the final answer, your best decision just might be to narrow down to 2 answers quickly and then guess.Want to know how to get to the actual answer for this problem, which is (B)? Take a look at the full solution here.The 4 Quant Strategies Everyone Must MasterHere’s a summary of our four strategies.(1) Test Cases.- Especially useful on Data Sufficiency with variables / unknowns. Pick numbers that fit the constraints given and test the statement. That will give you a particular answer, either a value (on Value DS) or a yes or no (on Yes/No DS). Then test another case, choosing numbers that differ from the first set in a mathematically appropriate way (e.g., positive vs. negative, odd vs. even, integer vs. fraction). If you get an “always” answer (you keep getting the same value or you get always yes or always no), then the statement is sufficient. If you find a different answer (a different value, or a yes plus a no), then that statement is not sufficient.- Also useful on “theory” Problem Solving questions, particularly ones that ask what must be true or could be true. Test the answers using your own real numbers and cross off any answers that don’t work with the given constraints. Keep testing, using different sets of numbers, till you have only one answer left (or you think you’ve spent too much time).(2) Choose Smart Numbers.- Used on Problem Solving questions that don’t require you to find something that must or could be true. In this case, you need to select just one set of numbers to work through the math in the problem, then pick the one answer that works.- Look for variable expressions (no equals or inequalities signs) in the answer choices. Will also work with fraction or percent answers.(3) Work Backwards.- Used on Problem Solving questions with numerical answers. Most useful when the answers are “easy”—small integers, easy fractions, and so on—and the problem asks for a single variable. Instead of selecting your own numbers to try in the problem, use the given answer choices.- Start with answer (B) or (D). If a choice doesn’t work, cross it off but examine the math to see whether you should try a larger or smaller choice next.(4) Estimate.- You’re likely already doing this whenever the problem actually asks you to find an approximate answer, but look for more opportunities to save yourself time and mental energy. When the answers are numerical and either very far apart or split across a “divide” (e.g., greater or less than 0, greater or less than 1), you can often estimate to get rid of 2 or 3 answers, sometimes even all 4 wrong answers. The biggest takeaway here is very simple: these strategies are just as valid as any textbook math strategies you know, and they also require just as much practice as those textbook strategies. Make these techniques a part of your practice: master how and when to use them, and you will be well on your way to mastering the Quant portion of the GMAT! ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors _________________ http://manhattangmat.com Manhattan GMAT Online Marketing Associate Joined: 14 Nov 2013 Posts: 69 Followers: 7 Kudos [?]: 13 [0], given: 0 Re: Manhattan GMAT Blog [#permalink] ### Show Tags 07 Jan 2014, 07:00  FROM Manhattan GMAT Blog: Andrew Yang: “Smart People Should Build Things” Excerpt 3 Below is an excerpt from Andrew Yang‘s new book, Smart People Should Build Things: How to Restore Our Culture of Achievement, Build a Path for Entrepreneurs, and Create New Jobs in America, which comes out in February 2014. Andrew was named Managing Director of Manhattan GMAT in 2006, Chief Executive Officer in 2007, and President in 2010. He left Manhattan GMAT in 2010 to start Venture for America, where he now serves as Founder and CEO.The Prestige Pathways Part II. You could ask, so what if our talented young people all march off to become lawyers, doctors, bankers, and consultants? Isn’t that what smart people are supposed to do?\There are a few problems with this stance. First, the degree to which the recruitment infrastructure exists is a relatively recent phenomenon. Bain and Company, a premier management consulting firm, wasn’t founded until 1973—now it employs over 5,000 talented people and recruits hundreds per year. The financial services industry has mushroomed in size, with Wall Street firms employing 191,800 at their peak in 2008, up from only 65,300 in 1975. The growth in professional services has given rise to an accompanying set of recruitment pipelines only in the past several decades.Yet the allocation of talent is a zero-sum game. If the academically gifted are funneled in higher numbers toward finance and consulting, then lesser numbers are going into other areas, such as the operation of companies, startups, and early-stage enterprises. In the United States, companies with fewer than 500 employees account for almost two-thirds of net new jobs and generate thirteen times more new patents per employee than do large firms. If the US economy had generated as many startups each year for 2009–12 as it had in 2007, the country would have produced almost 2.5 million new jobs by 2013. If we’re interested in spurring long-term job growth, we want as much talent as possible heading to new firms so that more of them can succeed, expand, and hire more people.Further, the current talent flows have a pronounced regional bias. The hubs for financial services and consulting are New York, San Francisco, Boston, Chicago, Los Angeles, and Washington, DC, and these cities are magnets for the preponderance of top university graduates. Meanwhile, dozens of other US cities and communities are home to promising growth companies that don’t have the talent they need to develop and expand. Companies in Detroit, New Orleans, Las Vegas, Providence, Baltimore, Cleveland, and other cities are poised to hire and to provide new opportunities and products. Yet our national university graduates are being consistently channeled elsewhere.*Professional services industries like finance, consulting, and legal services are, by definition, meta-industries. That is, they serve to help large companies raise money, buy and sell each other, reorganize, implement new systems, conduct complex transactions, and so forth. They are dependent on companies coming into being and becoming big enough to hire them. The economy needs more companies to start, grow, and thrive in order for the service organizations themselves to prosper. For example, if Mark Zuckerberg had become an investment banker or gone to work in a bank’s information technology department, then the bankers wouldn’t have had Facebook to take public. It’s actually far better for the investment banks (and everyone else) that instead of heading in their direction, he started his own company.Another issue is that professional paths aren’t always the right fit. Everyone reading this knows a host of former lawyers, bankers, consultants, academics, or doctors for whom the work or environment was not right, many of whom eventually left the profession or stuck around halfheartedly. This represents a massive social cost. Instead of an army of bright college graduates, we are left with an array of often indebted former professionals who are only starting years later what should have been their first act. Some find roles that fit. But for most this transition is not seamless; there are often time-consuming stumbles and periods of exploration before a new path is forged or found—if one is found.Last, and perhaps most important, professional services socialize individuals in ways that are not conducive to their ability to contribute in other ways. All of us, and particularly young people, have a tendency to view ourselves and our natures as static: you’ll choose to do something for a few years, and you’ll still be the same you. This isn’t the case. Spending your twenties traveling four days a week, interviewing employees, and writing detailed reports on how to cut costs will change you, as will spending years editing contracts and arguing about events that will never come to pass, or years producing Excel spreadsheets and moving deals along. After a while, regardless of your initial motivations, your lifestyle and personality will change to fit your role. You will become a better dispenser of well-presented recommendations, or editor of contracts, or generator of financial projections. And you will in all likelihood become less good at other things. You will not be the same person you were when you started.It is no accident that many of those we regard as our most productive individuals—Bill Gates, Steve Jobs, Jeff Bezos, Howard Schultz, Jack Dorsey, Reid Hoffman, Larry Page, Sergey Brin, and the like—were not products of our professional paths. Michael Dell actually entered the University of Texas intending to go to medical school. He probably would have made a fine doctor. But thanks to him over 100,000 people are now working at his namesake company, both in Texas and around the world.* One could argue that our national university system has become a de facto talent drain for much of the country. Many states and communities send their top students away to great schools, never to hear from them again. From SMART PEOPLE SHOULD BUILD THINGS by Andrew Yang© 2014 Andrew Yang. Reprinted courtesy of Harper Business, an imprint of HarperCollins Publishers. ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors _________________ http://manhattangmat.com Manhattan GMAT Online Marketing Associate Joined: 14 Nov 2013 Posts: 69 Followers: 7 Kudos [?]: 13 [0], given: 0 Re: Manhattan GMAT Blog [#permalink] ### Show Tags 13 Jan 2014, 07:00  FROM Manhattan GMAT Blog: Monthly GMAT Challenge Problem Showdown: January 13, 2013 We invite you to test your GMAT knowledge for a chance to win! The second week of every month, we will post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that month’s drawing for free Manhattan GMAT prep materials. Tell your friends to get out their scrap paper and start solving!Here is this month’s problem:If p, q, and r are different positive integers such that p + q + r = 6, what is the value of x ?(1) The average of xp and xq is xr.(2) The average of xp and xr is not xq.To see the answer choices, and to submit your answer, visit our Challenge Problem Showdown page on our site.Discuss this month’s problem with like-minded GMAT takers on our Facebook page.The monthly winner, drawn from among all the correct submissions, will receive One Year of Access to our Challenge Problem Archive, AND the OG Archer, AND Our Six Computer Adaptive Tests ($92 value).
ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors

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15 Jan 2014, 10:00
ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors

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Joined: 14 Nov 2013
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17 Jan 2014, 12:00
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Joined: 14 Nov 2013
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21 Jan 2014, 07:00
ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors

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Joined: 14 Nov 2013
Posts: 69
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25 Jan 2014, 10:00
ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors

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Manhattan GMAT Online Marketing Associate
Joined: 14 Nov 2013
Posts: 69
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Kudos [?]: 13 [0], given: 0

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28 Jan 2014, 11:00
ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors

_________________

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Manhattan GMAT Online Marketing Associate
Joined: 14 Nov 2013
Posts: 69
Followers: 7

Kudos [?]: 13 [0], given: 0

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02 Feb 2014, 06:00
ForumBlogs - GMAT Club’s latest feature blends timely Blog entries with forum discussions. Now GMAT Club Forums incorporate all relevant information from Student, Admissions blogs, Twitter, and other sources in one place. You no longer have to check and follow dozens of blogs, just subscribe to the relevant topics and forums on GMAT club or follow the posters and you will get email notifications when something new is posted. Add your blog to the list! and be featured to over 300,000 unique monthly visitors

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