BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

GmatPrep DS

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 30
Joined: Tue Mar 17, 2009 3:59 pm

GmatPrep DS

by gbb » Sun Mar 22, 2009 8:47 pm
help!!!

If 0<x<y, what is the value of (x+y)^2 / (x-y)^2?

(i) x^2 + y^2 = 3xy
(ii) xy = 3

answer A.
Top
Source: — Data Sufficiency |
Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pm
Thanked: 331 times
Followed by:11 members

by cramya » Sun Mar 22, 2009 8:54 pm
Expand (x+y)^2 = x^2+y^2 + 2xy

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


We need to find : x^2+y^2 + 2xy / x^2+y^2-2xy
Stmt I

x^2 + y^2 = 3xy

So what we need to find becomes 3xy+2xy/ 3xy-2xy

xy's cancel and we can get to the value(5)

SUFF

Stmt II

xy=3

We know y in terms of x or x is terms of y but we cant find the value.

INSUFF

Choose A
Top
Post new topic Post Reply
• Page 1 of 1