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GMAT Prep2 ?? (x and y)

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Source: — Data Sufficiency |
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by amitansu » Wed May 14, 2008 9:27 pm
B is ans.
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by codesnooker » Wed May 14, 2008 10:34 pm
Ans is (D)
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by amitansu » Thu May 15, 2008 7:05 am
yes you are right !! don't how i missed it.
silly mistake....
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Re: GMAT Prep2 ?? (x and y)

by Stuart@KaplanGMAT » Thu May 15, 2008 1:33 pm
dferm wrote:If x-y > 10, is x-y > x+y?

(1) x=8
(2) y = -20

Please Help..

Thanks...
Let's start by simplifying the question:

Is x - y > x + y?

If we subtract x from both sides, we get:

Is -y > y?

If we add y to both sides, we get:

Is 0 > y?

Or, in other words:

Is y negative?

Now that we've simplified the question, our life is much easier.

(1) x=8

So, 8 - y > 10
-y > 2
y < -2

Well, if y is less than -2, it's definitely less than 0: sufficient.

(2) y = -20

Well, if y is -20, it's definitely less than 0: sufficient.

Each of (1) and (2) is sufficient alone: choose (D).
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