GMAT Prep Data Sufficiency Question

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jrbrown2: Master | Next Rank: 500 Posts; Posts: 103; Joined: Sun Jun 10, 2007 7:10 pm; Location: Brooklyn, NY; Thanked: 2 times

by jrbrown2 » Sun Jun 17, 2007 7:09 pm

This DS question is driving me crazy?
Any help is greatly appreciated...

If 0<X<Y, what is the value of [(X+Y)^2]/[(X-Y)^2]?

(1) X^2 + Y^2 = 3XY
(2) XY = 3

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Source: Beat The GMAT — Data Sufficiency | Sun Jun 17, 2007 7:09 pm

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

by jayhawk2001 » Sun Jun 17, 2007 7:17 pm

(x^2 + y^2 + 2xy) / (x^2 + y^2 - 2xy)

1 - sufficient. 5xy / xy = 5. So, we know the value.

2 - insufficient. Just knowing xy will not help.

Hence A

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