prep question

jayhawk2001: Community Manager; Posts: 789; Joined: Sun Jan 28, 2007 3:51 pm; Location: Silicon valley, California; Thanked: 30 times; Followed by:1 members

by jayhawk2001 » Thu Jun 14, 2007 8:43 am

Is x-y > x+y
i.e. is -y > y.

To prove the above, we need to know if y is negative.

1 - sufficient. x=8 and x-y > 10. So, y is negative

2 - sufficient. y is negative

Is it D ?

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drhomler: Master | Next Rank: 500 Posts; Posts: 141; Joined: Thu May 03, 2007 1:15 pm

by drhomler » Thu Jun 14, 2007 9:04 am

Reworking the question in a similar fashion to Jay I get, is 2Y<0 or is Y neg?

1) Sufficient if x=8 than Y has to be neg for 8-y>10
2) Sufficient y=-20 it is indeed neg and we can say that it works

So D

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f2001290: Master | Next Rank: 500 Posts; Posts: 400; Joined: Sat Mar 10, 2007 4:04 am; Thanked: 1 times; Followed by:1 members

by f2001290 » Thu Jun 14, 2007 12:49 pm

One more D

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