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dunkin77
Really wants to Beat The GMAT!
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 Posted: Sun Apr 01, 2007 2:12 pm Post subject: 500 DS |
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Hi,
The answer is D but I thought the answer was B because 1) dose not say if Y and S are positive....
Is x – y > r – s?
(1) x > r and y < s?
(2) y = 2, s = 3, r = 5, and x = 6. |
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Prasanna
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| Posted: Sun Apr 01, 2007 6:10 pm Post subject: Re: 500 DS |
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| dunkin77 wrote: | Hi,
The answer is D but I thought the answer was B because 1) dose not say if Y and S are positive....
Is x – y > r – s?
(1) x > r and y < s?
(2) y = 2, s = 3, r = 5, and x = 6. |
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Hi
I tried substituting both positive and negative for the variables. I observe that (1) is sufficient to answer the question. Some of the values I considered
10-(-20)> 9-(-19)
-10-(20)>-11-(21)
-10-(-20)>-11-(-19)
Think the answer should be D. Did you come across any set of values for which it fails?
Prasanna |
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gabriel
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| Posted: Mon Apr 02, 2007 5:00 am Post subject: Re: 500 DS |
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| dunkin77 wrote: | Hi,
The answer is D but I thought the answer was B because 1) dose not say if Y and S are positive....
Is x – y > r – s?
(1) x > r and y < s?
(2) y = 2, s = 3, r = 5, and x = 6. |
remember this rule.... if a(1)>a(2) and a(3) > a(4) ...... then a(1) + a(3)>a(2)+a(4)....
applying this rule to the first statement ... x>r and s>y... so x+s>y+r ... so x-y>r-s ... so A is sufficient... |
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