m and n

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4meonly: Legendary Member; Posts: 891; Joined: Sat Aug 16, 2008 4:21 am; Thanked: 27 times; Followed by:1 members; GMAT Score:660(

by 4meonly » Wed Feb 18, 2009 11:48 am

OA D

Source: Beat The GMAT — Problem Solving | Wed Feb 18, 2009 11:48 am

x2suresh: Master | Next Rank: 500 Posts; Posts: 258; Joined: Thu Aug 07, 2008 5:32 am; Thanked: 16 times

by x2suresh » Wed Feb 18, 2009 12:41 pm

4meonly wrote:OA D

m^2+n^2 =4mn

m^2+n^2 +2mn=4mn+2mn
(m+n)^2 = 6m
(m-n)^2 = 2m

ratio = sqrt (3)

D

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