Find all School-related info fast with the new School-Specific MBA Forum

It is currently 20 Oct 2014, 03:41

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Took GMATPrep CAT Practice Test 1 today. Scored a 710 which

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
User avatar
Joined: 15 Sep 2009
Posts: 101
Schools: HBS, Stanford, Haas, Booth, Columbia
Followers: 1

Kudos [?]: 10 [0], given: 10

Took GMATPrep CAT Practice Test 1 today. Scored a 710 which [#permalink] New post 15 Sep 2009, 23:58
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (05:44) correct 0% (00:00) wrong based on 1 sessions
Took GMATPrep CAT Practice Test 1 today. Scored a 710 which I was surprised because of how many problems I missed. I missed 9 in Quant and 9 in Verbal. Projection was a 49 Quant and 38 Verbal. I have heard that people say that this test is most accurate. I have been scoring about a 680 on the Kaplan tests. I missed 5 in a row in quant and still got a 710!!! I just can't actually believe that they would let me get away with that. If anyone can verify that these projections are relatively semi-accurate, that would really calm my nerves.

Anyways, I found this problem and, although I have found the solution, I am sure that the steps I took to get there are not the most efficient. Here is the problem.

Data Sufficiency-

If n is a positive integer and r is the remainder when (n-1)(n+1) is divided by 23, what is the value of R?
1. n is not divisible by 2
2. n is not divisible by 3

My Solution: I finally found that the numbers that are not div by 2&3 end up being prime or prime multiples of primes. Then, I finally realized though trial and error that all numbers surrounding the primes (i.e n+1 & n-1) are divisible by 2x2x2x3 (24). I have no clue why this phenomenon works and really don't care to. Is there some way to approach a problem of this nature more efficiently?

I also struggled with this one...

Q: If n and y are both positive integers and 450y=n^3, which of following MUST be an integer?

I. y/(3x2x2x5)
II. y/(3x3x2x5)
III. y/(3x2x5x5)

I missed this and still don't know how to solve. Apparently the answer is Only "I" but I don't know why.


Thanks.

-Anthony

PS: If this is posted in the wrong place... please let me know. It's my first post.
Kaplan GMAT Prep Discount CodesKnewton GMAT Discount CodesManhattan GMAT Discount Codes
Expert Post
1 KUDOS received
Founder
Founder
User avatar
Affiliations: UA-1K, SPG-G, HH-D
Joined: 04 Dec 2002
Posts: 12332
Location: United States (WA)
GMAT 1: 750 Q49 V42
GPA: 3.5
WE: Information Technology (Hospitality and Tourism)
Followers: 2323

Kudos [?]: 9392 [1] , given: 3696

GMAT ToolKit User Premium Member CAT Tests
Re: Quant Problem Help Please [#permalink] New post 16 Sep 2009, 00:59
1
This post received
KUDOS
Expert's post
Welcome to GMAT Club!

GMAT Prep is pretty accurate and your score is up there - congrats. The number of questions you miss does not matter, rather the number of hard questions you answer correctly - different concept that takes a while to get used to.


Your post got moved to the right place - you will get the most help in the Math Forums.
No worries. We do have the largest database of questions and looks like yours have been addressed


Here is the answer to your first question:
remainder-r-82374.html


And here is the answer to the second one:
gmat-prep-n-71951.html
_________________

Founder of GMAT Club

Just starting out with GMAT? Start here... | Want to know your GMAT Score? Try GMAT Score Estimator
Need GMAT Book Recommendations? Best GMAT Books

Co-author of the GMAT Club tests

Have a blog? Feature it on GMAT Club!

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Manager
Manager
User avatar
Joined: 15 Sep 2009
Posts: 101
Schools: HBS, Stanford, Haas, Booth, Columbia
Followers: 1

Kudos [?]: 10 [0], given: 10

Re: Quant Problem Help Please [#permalink] New post 16 Sep 2009, 08:30
The second question was a great explanation and I understand that now. However, I still do not understand the first problem after viewing the link that you sent.
Intern
Intern
avatar
Joined: 13 Sep 2009
Posts: 16
Followers: 0

Kudos [?]: 3 [0], given: 0

Re: Quant Problem Help Please [#permalink] New post 16 Sep 2009, 20:44
I don't understand the first problem too :?:
Current Student
avatar
Affiliations: ?
Joined: 20 Jul 2009
Posts: 191
Location: Africa/Europe
Schools: Kellogg; Ross ($$); Tuck
Followers: 2

Kudos [?]: 29 [0], given: 6

Re: Quant Problem Help Please [#permalink] New post 17 Sep 2009, 00:49
aj1545 wrote:
The second question was a great explanation and I understand that now. However, I still do not understand the first problem after viewing the link that you sent.


it's because the link was not the good one.

Here is the link to that question

http://gmatclub.com/forum/gmatprep-division-by-24-again-83312.html
Re: Quant Problem Help Please   [#permalink] 17 Sep 2009, 00:49
    Similar topics Author Replies Last post
Similar
Topics:
1 Experts publish their posts in the topic I just took my GMATPrep CAT, a truly baffling verbal score! jtyee 3 21 Apr 2014, 14:57
6 Took the test today - 720 dreambeliever 7 28 Apr 2012, 19:41
Took 1st GMATPrep Test flash2374 5 30 Apr 2010, 19:52
I'll never get how GMATPrep counts score... Today took test, Piter 4 06 Sep 2007, 13:42
GMATPrep Practice test 1 macsurf 2 13 May 2007, 07:34
Display posts from previous: Sort by

Took GMATPrep CAT Practice Test 1 today. Scored a 710 which

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.