January 19, 2019 January 19, 2019 07:00 AM PST 09:00 AM PST Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT. January 20, 2019 January 20, 2019 07:00 AM PST 07:00 AM PST Get personalized insights on how to achieve your Target Quant Score.
Author 
Message 
Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
03 Jul 2016, 16:31
If (1+x)y=y, which of the following must be true? A. x=1 or y=0 B. x=0 or y=0 C. x=1 or y=1 D. x=1 or y=1 E. x=0 or y=1 From y+xy=y, we get xy=0. Hence, the correct answer is B.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
04 Jul 2016, 22:40
A(n+1)=1+(1/A(n)) and A(1)=1. What is the value of A(5)? A. 2 B. 3/2 C. 5/3 D. 8/5 E. 13/8 Ans: If we substitute directly, the answer comes out to be D.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
05 Jul 2016, 20:12
What is the units digit of 3^66? A. 1 B. 3 C. 5 D. 7 E. 9 ANS: From 3^1=3, 3^2=9, 3^3=27, 3^4=81, the unit digit repeats in 3>9>7>1>3. Then, from 3^66=3^(4(16)+2), the unit digt is same as that of ^2. Hence, the answer is 9 and the correct answer choice is E.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
06 Jul 2016, 15:52
Which of the following is closest to (10^1910^3)/(10^17+1)? A. 0.01 B. 0.1 C. 0.2 D. 1 E. 10 ANS: We get (10^1710^3)/(10^17+1)≒(10^19)/(10^17)=1/100=0.01. Hence, the correct answer is A.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
08 Jul 2016, 20:41
Which of the following is closest to (10!9!)/(10!+9!)? A. 0.01 B. 0.1 C. 0.2 D. 1 E. 10 ANS: (10!9!)/(10!+9!)=(101)9!/(10+1)9!≒9/11=1. Hence, the correct answer is D
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
11 Jul 2016, 17:27
What is the scope including 1/21+1/12+1/13+......+1/30? A 1/6~1/5 B. 1/5~1/4 C. 1/4~1/3 D. 1/3~1/2 E. 1/2~1 ANS: The sum of sequence is determined by the first and the last number. So, 1/3=10/30<1/21+1/12+1/13+......+1/30<10/21<10/20=1/2. The correct answer is D
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
12 Jul 2016, 17:58
8√4n=(4√2)^8, n=? A. 4^8 B. 4^10 C. 4^12 D. 4^16 E. 4^32 ANS: D
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
14 Jul 2016, 00:08
What is the prime factors’ number of 24? A. 2 B. 3 C. 4 D. 5 E. 6 ANS: From 24=3(2^3), we get 2,2,2 and 3. Hence, the number of prime factors is 4.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
14 Jul 2016, 20:25
a is an integer greater than 19 but less than 31, b is an integer greater than 29 but less than 41, what is the range of a/b? A. 1/4 B. 1/2 C. 3/4 D. 1 E. 5/4 ANS: From 20≤a≤30 and 30≤b≤40, we get 1/2=20/40≤a/b≤30/30=1. Hence, range=Maxmin=11/2=1/2 and the correct answer is B.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
18 Jul 2016, 03:15
What number is 72 more than threefourth of itself? A. 138 B. 225 C. 288 D. 324 E. 336 ANS: From n=72+(3n/4), n/4=72, n=72(4)=288 Hence, the correct answer is C
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
18 Jul 2016, 08:24
If a, b are integers and ab=8, which of the following is the smallest possible value of ab? A. 16 B. 0 C. 16 D. 7 E. 40 ANS: a=4, b=4. Hence, the answer is A.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
24 Jul 2016, 01:43
What is the units digit of 17^381? A. 1 B. 3 C. 5 D. 7 E. 9 ANS: From ~7^1=~7, ~7^2=9, ~7^3=~3, ~7^4=~1, the units digit is 7>9>3>1>7, and it repeats like this. Then from 17^381=17^(4(95)+1), we can see that the units digit is same as 17^1, which is 7. The answer is, then, D.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
25 Jul 2016, 18:37
What is the scope including 1/11+1/12+1/13+......+1/20? A 1/6~1/5 B. 1/5~1/4 C. 1/4~1/3 D. 1/3~1/2 E. 1/2~1 ANS: The sum of a sequence of reciprocals is determined by the first and the end term. So, since 1/2=10/20<1/11+1/12+1/13+......+1/20<10/11<10/10=1, the correct answer is E.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
26 Jul 2016, 17:27
If two integers x,y (x>y) are selected from 5 to 4(inclusive), how many cases are there? A. 15 B. 18 C. 36 D. 45 E. 90 ANS: 10C2=45. Hence, the correct answer is D.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Math Revolution Approach (PS)
[#permalink]
Show Tags
31 Jul 2016, 08:02
Which of the following is equal to 1(1/5)%? A. 0.012/100 B. 0.12/100 C. 1.2/100 D. 12/100 E. 12/10 ANS: If we substitute %=1/100, we get 1(1/5)%=(1+1/5)%=(6/5)%=( 6/5)( 1/100)= (1.2)/100 So, the answer is C.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
04 Aug 2016, 03:45
1+2+2^2+2^3+2^4+2^5=？ A. (2^31)(2^3+1) B. 2^6+1 C. 2^51 D. 2^5+1 E. 2^52 ANS: From 1+2+2^2+2^3+2^4+2^5=1(2^61)/(21)=2^61=(2^31)(2^3+1), the correct answer is A.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
04 Aug 2016, 18:20
If (x^32x^2+x1)^21=(xa)(xb)(xc)(xd)(xe)(xf), then abcdef=? A. 0 B. 25 C. 25 D. 24 E. 24 ANS: If we substitute x=0, from (1)^21=(a)(b)(c)(d)(e)(f)=abcdef, we get abcdef=0.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
07 Aug 2016, 16:53
Which of the following lines has xintercept and yintercept that are integers? A. y=3x+1 B. y=√x+1 C. y=2/x D. y=x^21 E. xy=1 ANS: Values that satisfy y=x^21 are (x,y)=(1,0),(1,0),(0,1). Hence, they are all integers and the correct answer is D.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
08 Aug 2016, 17:24
What is the tens digit of 7^381? A. 0 B. 3 C. 5 D. 7 E. 9 ANS: From ~7^1=~07, ~7^2=~49, ~7^3=~43, ~7^4=~01, the tens digit repeats 0>4>4>0>0. Then, from 7^381=7^(4(95)+1), the tens digit is same as ~7^1. Hence, it is 0.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 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: 6815
GPA: 3.82

Re: Math Revolution Approach (PS)
[#permalink]
Show Tags
22 Aug 2016, 18:52
If 1/(x(x+1))+1/((x+1)(x+2))=1/(x+1), what is the value of x? A. √2 B. ±√2 C. 1 D. 2 E. √5 *Answer: If we solve the question, we get x=±√2.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The oneandonly World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only $149 for 3 month Online Course" "Free Resources30 day online access & Diagnostic Test" "Unlimited Access to over 120 free video lessons  try it yourself"




Re: Math Revolution Approach (PS) &nbs
[#permalink]
22 Aug 2016, 18:52



Go to page
Previous
1 2 3 4 5 6 7 8 9 10 11 ... 29
Next
[ 568 posts ]



