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Problem Solving (PS) | Re: A certain population of bacteria doubles every 10 minutes.

September 15, 2019, 1:00 am
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Bunuel wrote:

The Official Guide For GMAT® Quantitative Review, 2ND Edition

A certain population of bacteria doubles every 10 minutes. If the number of bacteria in the population initially was 10^4, what was the number in the population 1 hour later?

(A) 2(10^4)
(B) 6(10^4)
(C) (2^6)(10^4)
(D) (10^6)(10^4)
(E)(10^4)^6

Problem Solving
Question: 22
Category: Arithmetic Operations on rational numbers
Page: 64
Difficulty: 600


GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!


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Problem Solving (PS) | Re: Of the people who responded to a market survey, 120 preferred Brand X

September 15, 2019, 1:00 am
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NYCgirl15 wrote:

Of the people who responded to a market survey, 120 preferred Brand X and the rest preferred Brand Y. If the respondents indicated a preference for Brand X over Brand Y by ratio of 3 to 1, how many people responded to the survey?

A. 80
B. 160
C. 240
D. 360
E. 480


We can solve this question by usingequivalent ratios

We'll use the ratio:preferred Brand X /preferred Brand Y Given:120 preferred Brand X
Lety = the number of people who preferred Brand Y

We get:120 /y =3 /1 Cross multiply to
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Problem Solving (PS) | Re: In the equation above, k is a constant. If y = 17 when x = 2

September 15, 2019, 1:00 am
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Bunuel wrote:

The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

y = kx + 3

In the equation above, k is a constant. If y = 17 when x = 2, what is the value of y when x = 4 ?

(A) 34
(B) 31
(C) 14
(D) 11
(E)7

Practice Questions
Question: 54
Page: 159
Difficulty: 600


GMAT Club is introducing a new project: The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide for GMAT® Review, 13th Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!


...
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Problem Solving (PS) | Re: If x/4 is 2 more than x/8, then x =

September 15, 2019, 1:00 am
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Bunuel wrote:

The Official Guide For GMAT® Quantitative Review, 2ND Edition

If x/4 is 2 more than x/8, then x =

(A) 4
(B) 8
(C) 16
(D) 32
(E)64

Problem Solving
Question: 2
Category: Algebra First-degree equations
Page: 62
Difficulty: 500


GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!


...
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Problem Solving (PS) | Re: What is the larger of the 2 solutions of the equation x^2 − 4x = 96 ?

September 15, 2019, 1:00 am
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AbdurRakib wrote:

What is the larger of the 2 solutions of the equation \(x^2\) − 4x = 96 ?
A.8
B.12
C.16
D.32
E.100

OG Q 2017(Book Question: 68)


x^2-12x*8x-96=0
(x-12)(x+8)=0
x = 12 or -8
Larger solution = 12

IMO B

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Problem Solving (PS) | Re: If x(2x + 1) = 0 and (x + 1/2)(2x - 3) = 0, then x =

September 15, 2019, 1:00 am
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Walkabout wrote:

If x(2x + 1) = 0 and (x + 1/2)(2x - 3) = 0, then x =

(A) -3
(B) -1/2
(C) 0
(D) 1/2
(E) 3/2


x(2x+1)=0
x=0 or -1/2

(x+1/2)(2x-3)=0
x=-1/2 or 3/2

x=-1/2 is common to both equations

IMO B

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Problem Solving (PS) | Re: If 1.5/(0.2+x)=5, then x=

September 15, 2019, 1:00 am
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Solve the equation and get the answer , it’s a straight forward question .

One can even go for plugging in the answer choice and check .
Correct answer is 0.1 , (B)

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Problem Solving (PS) | Re: A construction company wants to number new houses using digit plates

September 15, 2019, 1:00 am
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Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Problem Solving (PS) | Re: Every day a certain bank calculates its average daily

September 15, 2019, 1:00 am
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Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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Data Sufficiency (DS) | Does positive integer a equal 5? (1) a is a not factor of 6006.

September 15, 2019, 1:00 am
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Bunuel wrote:

Does positive integer a equal 5?

(1) a is a not factor of 6006.
(2) 5 is the largest divisor of a.


Target question: Does positive integer a equal 5?

Statement 1: a is a not factor of 6006.
There are several values of a that satisfy statement 1. Here are two:
Case a 5 is not a factor of 6006, so, it could be the case that a = 5. In this case, the answer to the target question isYES, a = 5
Case b 4 is not a factor of 6006, so, it could be the case that a = 4. In this case, the answer to
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Problem Solving (PS) | Re: If the operation @ is defined for all a and b by the equatio

September 15, 2019, 1:00 am
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pete300 wrote:

If the operation @ is defined for all a and b by the equation a@b =(a^2*b)/3, then 2@(3@-1) =

A. 4
B. 2
C. -4/3
D. -2
E. -4


3@-1 = 9(-1)/3 = -3
2@-3= 4(-3)/3 =-4

IMO E

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Data Sufficiency (DS) | Re: Last year, the five employees of company X took an average

September 15, 2019, 1:00 am
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Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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Problem Solving (PS) | Re: In the table above, what is the number of green marbles in J

September 15, 2019, 1:00 am
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Bunuel wrote:

Image
In the table above, what is the number of green marbles in Jar R ?

(A) 70
(B) 80
(C) 90
(D) 100
(E) 110

Practice Questions
Question: 55
Page: 159
Difficulty: 600


Spoiler: ::



Adding 3 equations
x+y+z=180
x+y=80
z=100

IMO D

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Problem Solving (PS) | Re: If x ≠ 2, then (3x^2(x-2)-x+2)/(x-2)=

September 15, 2019, 1:00 am
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Problem Solving (PS) | Re: Which of the following equations is NOT equivalent to 10y^2=

September 15, 2019, 1:00 am
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Bunuel wrote:

Which of the following equations is NOT equivalent to \(10y^2=(x+2)(x-2)\) ?



(A)\(30y^2=3x^2-12\)
3*equation
(B)\(20y^2=(2x-4)(x+2)\)
2*equation
(C)\(10y^2+4=x^2\)
Equation
(D)\(5y^2=x^2-2\)
10y^2 = 2x^2-4
NOT THE EQUATION
(E)\(y^2=\frac{(x^2-4)}{10}\)
Equation/10

IMO D

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Problem Solving (PS) | Re: If x + y = 2 and x^2 + y^2 = 2, what is the value of xy ?

September 15, 2019, 1:00 am
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Bunuel wrote:

If x + y = 2 and x^2 + y^2 = 2, what is the value of xy ?

A. –2
B. –1
C. 0
D. 1
E. 2


(x+y)^2= x^2+y^2+2xy
4 = 2 + 2xy
xy = 1

IMO D

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Problem Solving (PS) | Re: If (4 - x)/(2 + x) = x, what is the value of x^2 + 3x -4 ?

September 15, 2019, 1:00 am
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Walkabout wrote:

If (4 - x)/(2 + x) = x, what is the value of x^2 + 3x -4 ?

(A) -4
(B) -1
(C) 0
(D) 1
(E) 2


4-x = 2x + x^2
x^2+3x-4=0

IMO C

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Problem Solving (PS) | Re: There are 40 students in a classroom, 9/20 of students are boys and 4/

September 15, 2019, 1:00 am
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Total students = 40

Boys = (9/20)*40 = 18

So, Girls = 40 - 18 = 22

Right-handed = (4/5)*40 = 32

In order for the number of right-handed boys to be minimum, the number of right-handed girls needs to be maximum and that is possible if all of the 22 girls in the classroom are right-handed.
In that case, the remaining (32 - 22) = 10 right-handed students will be the minimum number of boys.

Hence, option (A).
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Problem Solving (PS) | If x and y are odd positive integers, and x and y both have an odd

September 15, 2019, 1:00 am
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If x and y are positive odd integers, and both numbers have an odd number of positive divisors, which of the following could be the value of x-y?

A) 4818
B) 5174
C) 5320
D) 5482
E) 5566
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Data Sufficiency (DS) | Re: If x and y are integers great than 1, is x a multiple of y?

September 15, 2019, 1:00 am
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GMATPrepNow wrote:

jananijayakumar wrote:
If x and y are integers great than 1, is x a multiple of y?

(1) \(3y^2+7y=x\)

(2) \(x^2-x\) is a multiple of y

Spoiler: ::



Target question: Is x a multiple of y?
Asking whether x is a multiple of y is the same as asking whether x = (y)(some integer) For example, 12 is a multiple of 3 because 12 = (3)(4) So, let's rephrase the question as...
REPHRASED target question: Does x = (y)(some integer)?

Statement 1: 3y² + 7y = x
Factor to get x = y(3y + 7
If y
...
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