Problem Solving (PS) | Re: PS: must be a multiple of 25

July 25, 2022, 1:00 am

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PS Archive | PS: must be a multiple of 25

July 25, 2022, 1:00 am

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Data Sufficiency (DS) | Re: If x and y are positive integers, what is the value of x y?

July 25, 2022, 1:00 am

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BrentGMATPrepNow wrote:

If$x$ and$y$ are positive integers, what is the value of$ x –y$ ?

(1) The greatest common divisor of$x$ and$y$ is$1$ .
(2)$\frac{13x}{y}$ is a positive integer with exactly two positivedivisors.

Given :$x$ and$y$ are positiveintegers

Targetquestion: What is the value of$ x –y$ ?

Statement1 : The greatest common divisor of$x$ and$y$ is$1$
There are several values of x and y that satisfy statement 1. Here are two:
Casea : If x = 1 and y = 1, then the greatest common divisor of x and y is 1. In this case,
...

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PS Archive | PS: Greatest value for X

July 25, 2022, 1:00 am

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Problem Solving (PS) | Re: PS: Greatest value for X

July 25, 2022, 1:00 am

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July 25, 2022, 1:00 am

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Data Sufficiency (DS) | Re: http://i13.tinypic.com/2ch9htk.gif

July 25, 2022, 1:00 am

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Problem Solving (PS) | Re: If 1/2 of the money in a certain trust fund was invested in stocks, 1/

July 25, 2022, 1:00 am

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Problem Solving (PS) | Re: In 1990 the budgets for projects Q and V were $ 660,000

July 25, 2022, 1:00 am

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Problem Solving (PS) | Re: In a nationwide poll, P people were asked whether they would

July 25, 2022, 1:00 am

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PS Archive | In a nationwide poll, P people were asked whether they would

July 25, 2022, 1:00 am

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Data Sufficiency (DS) | Re: If 1 book was left when a pile of books was stacked in rows

July 25, 2022, 1:00 am

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GMAT Club Tests | Re: This one kinda looks simple. But I didn't like the OE too

July 25, 2022, 1:00 am

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PS Archive | This one kinda looks simple. But I didn't like the OE too

July 25, 2022, 1:00 am

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Problem Solving (PS) | The ratio of cost of a notebook and a pen for the shopkeeper

July 25, 2022, 1:00 am

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CP of notebook- 3k
SP of notebook- 4.5k (3k*1.5)
CP of pen- 2k

When 10 notebooks is sold, two pens are also given by the Shopkeeper. So total cost price is equal to - 34k (3k*10+2k*2) and total selling price is 45k (4.5k*10)

Now profit is 231 , thus 45k-34k=231 so k=21.

To find cost of a pen and notebook. 5k=105 so 105 (A) is the correct answer

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Problem Solving (PS) | Re: A committe of three students has to be formed. There are

July 25, 2022, 1:00 am

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PS Archive | A committe of three students has to be formed. There are

July 25, 2022, 1:00 am

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Problem Solving (PS) | Re: At a certain company, operating expenses are measured as the sum of

July 25, 2022, 1:00 am

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Operating expense initially- OE= PE + IS (eqn 1)

Operating expense later on OE(102/100)=PE(105/100)+ IS(101/100) - eqn 2

Multiply equation 1 by 101 and the subtract it from equation 2

Thus final equation will be OE= 4PE or PE is 25 % of OE

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Data Sufficiency (DS) | Re: If P is a set of integers and 3 is in P, is every positive

July 25, 2022, 1:00 am

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Problem Solving (PS) | Re: As x increases from 141 to 142, which of the following increases?

July 25, 2022, 1:00 am

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HERE
OPTION A-when we substitute Value of x+1-1/(x+1)-x+1/x value is =1+1/(x+1)(x) this is positive was x>0
option b-when we substitute value of 17-1/x-17+1/(x+1)= -1/(x+1)(x) this is negative for all x>0
Option C when we substitute value of 17/(x+1)+1-17/(x)-1= 17(1)/(x)(X+1) this positive when x>0
then proved A and C is the Answer!

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