Author 
Message 
Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
26 Jul 2016, 18:38
Becareful on the common mistake type 4(B) If x and y are integers, is xy an even? 1) x=even 2) y=odd There are 2 variables in the original condition and there is a high chance that C is the correct answer. Using 1) and 2), C is the correct answer. However, since this is one of key questions, con 1) is always yes. The condition is sufficient and the correct answer is A.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
04 Aug 2016, 04:53
This is a difficult inequality question. (ex 6) *(inequality) If 0.01<a<0.02, 5,000<b<10,000, which of the following can be the value of (1/a2)+(1/b2)? A. 0.2 B. 0.5 C. 750 D. 525 E. 7250 Answer: E
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
08 Aug 2016, 18:28
Please remember that DS questions will determine a score of 51 and also important are common mistake type questions.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
09 Aug 2016, 19:41
Again, GMAT Math is a test of logic. As long as you have a firm and strong grasp of logic of GMAT Math, you will be able to score high in the test.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
10 Aug 2016, 20:29
As stated in the post, you should remember that Integer and Statistics are the main chapters to focus for DS.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
11 Aug 2016, 22:37
We are not english experts as stated in the post. So please let us know if there are any mistakes to be corrected. Also, feel free to send us messages if you have any questions!
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Senior Manager
Status: Always try to face your worst fear because nothing GOOD comes easy. You must be UNCOMFORTABLE to get to your COMFORT ZONE
Joined: 15 Aug 2014
Posts: 266
Concentration: Marketing, Technology
GMAT 1: 570 Q44 V25 GMAT 2: 600 Q48 V25
WE: Information Technology (Consulting)

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
12 Aug 2016, 06:40
MathRevolution wrote: This is also a 5051 level question and is related to the common mistake type 4(A) When 25 integers are there such that their average (arithmetic mean) is 100, is their median equal to 100? 1) They are consecutive 2) The average (arithmetic mean) of the greatest number and the smallest number of them is 100
There are 2 variables in the question. Hence, C could be the answer. However, since this is an integer question, we have to apply the common mistake type 4(A). Then, we can see that A is the correct answer. Doesn't option 'B' says numbers are consecutive ! can someone advise pls
_________________
"When you want to succeed as bad as you want to breathe, then you’ll be successful.”  Eric Thomas
I need to work on timing badly!!



Senior Manager
Status: Always try to face your worst fear because nothing GOOD comes easy. You must be UNCOMFORTABLE to get to your COMFORT ZONE
Joined: 15 Aug 2014
Posts: 266
Concentration: Marketing, Technology
GMAT 1: 570 Q44 V25 GMAT 2: 600 Q48 V25
WE: Information Technology (Consulting)

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
12 Aug 2016, 07:08
MathRevolution wrote: This is a difficult inequality question. (ex 6) *(inequality) If 0.01<a<0.02, 5,000<b<10,000, which of the following can be the value of (1/a2)+(1/b2)? A. 0.2 B. 0.5 C. 750 D. 525 E. 7250 Answer: E Can someone elaborate how to solve above problem
_________________
"When you want to succeed as bad as you want to breathe, then you’ll be successful.”  Eric Thomas
I need to work on timing badly!!



Senior Manager
Status: Always try to face your worst fear because nothing GOOD comes easy. You must be UNCOMFORTABLE to get to your COMFORT ZONE
Joined: 15 Aug 2014
Posts: 266
Concentration: Marketing, Technology
GMAT 1: 570 Q44 V25 GMAT 2: 600 Q48 V25
WE: Information Technology (Consulting)

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
12 Aug 2016, 07:16
MathRevolution wrote: There are some difficult PS questions that appear as 5051 level questions. In the x y plane, there are 4 points (0,0), (0,4), (6,4), and (6,0). If these 4 points makes a rectangle, what is the probability that x+y<4? A. 1/2 B. 1/3 C. 1/4 D. 1/5 E. 2/5 Answer: B If we draw conditions on coordinates, the correct answer is B. Please elaborate how to solve above question
_________________
"When you want to succeed as bad as you want to breathe, then you’ll be successful.”  Eric Thomas
I need to work on timing badly!!



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
14 Aug 2016, 02:06
Please remember that GMAT Quant section is in CAT system. This means that you have to get as many easy questions as right in order to move on to 4951 score level!
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
16 Aug 2016, 07:35
sairam595 wrote: MathRevolution wrote: This is a difficult inequality question. (ex 6) *(inequality) If 0.01<a<0.02, 5,000<b<10,000, which of the following can be the value of (1/a2)+(1/b2)? A. 0.2 B. 0.5 C. 750 D. 525 E. 7250 Answer: E Can someone elaborate how to solve above problem Here is an answer to your question!
Attachments
3rd.jpg [ 2.37 MiB  Viewed 1162 times ]
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
18 Aug 2016, 07:17
Questions related to Murphy's and Sally's law can appear as 51 level questions!
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
21 Aug 2016, 00:12
As always, questions combined with the mistake type 3 and 4 are given. Let's have a look at the example below. This is a very recent question, which also belongs to the mistake type 4(B). This question is on the level of score 5051. You should be able to tackle a question like this. In addition, you should be aware of relation between approach method to variables and the mistake types. Is 7digit positive integer a,bcd,150 divisible by 6? 1) a,bcd,000 is divisible by 6. 2) a+b+c+d is divisible by 3. Both C and D can be answers for this type of questions. This is a common mistake type 4(B) question which is in the level of 5051.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
22 Aug 2016, 20:06
If x, y are positive integers, what is the remainder when (2^8x+6)+y is divided by 5? 1) x=3 2) y=1 This is a general common mistake type 4(A) question. There are 3 variables in the original condition. Hence, there is a high chance that E is the correct answer. Using 1) & 2), we get 2^30+1=~5. The remainder is 0. Hence, the correct answer is unique and the condition is sufficient – C is the correct answer. However, since it is one of key questions, we can apply the common mistake type 4(A). From (2^8x+6), we can see that the units digit is always 4. Hence, we only have to know 4. Thus, the correct answer is B.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
24 Aug 2016, 05:50
There are many difficult PS questions nowadays. Which of the following is equal to (a^2)/a? (a is not zero) I. a II. (a^2)/a III. ((a/a)^2)a A. I only B. II only C. III only D. I & III only E. II & III only Since, (a^2)/a=(a^2)/a=a. The correct answer is D.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
25 Aug 2016, 18:34
This is a consecutive integers question. If x, y, z are integers, is xyz a multiple of 3? 1) x+y+z is a multiple of 3 2) x, y, and z are consecutive There is 1 variable in the original condition. Hence, there is a high chance that D is the correct answer. In case of con 1), we have (x,y,z)=(1,2,4) yes, (x,y,z)=(2,2,2) n. Hence, the condition is not sufficient. In case of condition 2), if x, y, z are consecutive integers, they always have 3. Hence, the answer is yes and the condition is sufficient. Thus, the correct answer is B.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
27 Aug 2016, 05:35
When m and are positive integers, is 2m+2n divisible by 5? 1) m=n+2 2) n=3 There are 2 variables (a and b) in the original condition. There is a high chance that C is the correct answer. Using con 1) and 2), the correct answer is C. However, since this is one of key questions, if we apply common mistake type 4(A), using con 1), we get 2^m+2^n=(2^n+2)+2^n=(2^2+1)2^n=5(2^n). It is always divisibly by 5. The answer is yes and the condition is sufficient. Hence, the correct answer is A.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
30 Aug 2016, 20:25
Again, it is cruticial to get the first 20 questions right!!
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GPA: 3.82

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
01 Sep 2016, 17:50
Please remember that DS questions will be a determinant for a perfect 51.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spareThe oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $79 for 1 month Online Course""Free Resources30 day online access & Diagnostic Test""Unlimited Access to over 120 free video lessons  try it yourself"



Director
Joined: 06 Jan 2015
Posts: 714
Location: India
Concentration: Operations, Finance
GPA: 3.35
WE: Information Technology (Computer Software)

Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
Show Tags
02 Sep 2016, 08:53
MathRevolution wrote: This is a 5051 level question
(ex 7) *(integer) What is the greatest common divisor of positive integers n and m? 1) n=1 2) m=n+1 There are 2 variables in the original condition (m, n). In order to match the number of variables and the number of equations, we need 2 equations. Hence, there is a high chance that C is the correct answer. Using 1) and 2), C is the correct answer. However, we have to utilize the common mistake type 4(B) since it is an integer question. The correct answer is D. MathRevolution Could pls elaborate this que how the ans is D
_________________
आत्मनॊ मोक्षार्थम् जगद्धिताय च Resource: GMATPrep RCs With Solution




Re: The Ultimate Q51 Guide [Expert Level]
[#permalink]
02 Sep 2016, 08:53



Go to page
Previous
1 ... 4 5 6 7 8 9 10 11 ... 47
Next
[ 931 posts ]



