PS: Equations

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beater: Master | Next Rank: 500 Posts; Posts: 301; Joined: Tue Apr 22, 2008 6:07 am; Thanked: 2 times

by beater » Wed Sep 17, 2008 12:05 pm

If x, y, and k are positive numbers such that (x/x+y) (10) + (y/x+y) (20) = k and if x < y, which of the following could be the value of k?

A. 10

B. 12

C. 15

D. 18

E. 30

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Source: Beat The GMAT — Problem Solving | Wed Sep 17, 2008 12:05 pm

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Ian Stewart: GMAT Instructor; Posts: 2623; Joined: Mon Jun 02, 2008 3:17 amFollowed by: 355 members; Location: Montreal; Thanked: 1090 times; GMAT Score:780

by Ian Stewart » Wed Sep 17, 2008 12:51 pm

I posted a solution here:

www.beatthegmat.com/number-system-sets-t14684.html

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