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Re: gmat prep question

by Prasanna » Mon May 28, 2007 4:21 pm
yvonne12 wrote:if x-y>10, is x-y > x+y

1. x=8
2. y=-20

please explain
Is the answer d.

1. x=8. This means 8-y>10
=> -y>2 => y<-2. For all values where x=8 and y less than -2 we can determine that x-y > x+y . Hence sufficient.
2. y=-20. This means x+20>10 or x>-10. Again we can determine that x-y > x+y . Hence sufficient.
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