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Does x – y = 200? (1) x=10^2 (2) x=100 and y=-100

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Does x – y = 200? (1) x=10^2 (2) x=100 and y=-100  [#permalink]

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New post 17 Mar 2015, 08:39
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Does x – y = 200?

(1) x=10^2
(2) x=100 and y=-100


Hi All,

I know this maybe an easy question, but I don't understand where i'm going wrong.


I figured the answer would be D, however the official answer shows as B. Could someone help me explain how the answer is B and not D please?
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Joined: 02 Sep 2009
Posts: 51218
Re: Does x – y = 200? (1) x=10^2 (2) x=100 and y=-100  [#permalink]

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New post 17 Mar 2015, 09:02
pinkcupcake wrote:
Hi All,

I know this maybe an easy question, but I don't understand where i'm going wrong.

Does x – y = 200?

(1) x=10^2
(2) x=100 and y=-100

I figured the answer would be D, however the official answer shows as B. Could someone help me explain how the answer is B and not D please?


The question asks whether x – y = 200.

From (1) we know that x=100, without knowing value of y, how can we say whether x – y = 200? If y=-100, then the answer is YES but if y is any other number then the answer is NO. Not sufficient.

(2) gives the values of both x and y, so we can calculate whether x – y = 200. Sufficient.

Answer: B.

Hope it's clear.
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Re: Does x – y = 200? (1) x=10^2 (2) x=100 and y=-100  [#permalink]

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New post 17 Mar 2015, 09:14
pinkcupcake wrote:
Hi All,

I know this maybe an easy question, but I don't understand where i'm going wrong.

Does x – y = 200?

(1) x=10^2
(2) x=100 and y=-100

I figured the answer would be D, however the official answer shows as B. Could someone help me explain how the answer is B and not D please?



This is a typical Yes/no Ds question which means expected answer should be either yes or no.
Question is not asking you to Calculate value.

Using 1st statement , you know x=100 but no idea about Y. so insufficient
Using 2nd statement , 100-(-100)=100+100=200 , so you get answer here as YES, x-y =200 so Statement 2 alone suffiecient . (please not if you had got answer as NO , x-y is not equal to 200 then also this statement would be sufficient )

hope this helps :)
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Re: Does x – y = 200? (1) x=10^2 (2) x=100 and y=-100  [#permalink]

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New post 01 Nov 2018, 18:31
gmatbusters wrote:
Does x – y = 200?
(1) x = 10^2
(2) x = 100 and y = -100


St1:- No info on y. Insufficient

St2:- x-y=100-(-100)=200
Sufficient.

Ans. (B)
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Re: Does x – y = 200? (1) x=10^2 (2) x=100 and y=-100 &nbs [#permalink] 01 Nov 2018, 18:31
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