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NSNguyen: Master | Next Rank: 500 Posts; Posts: 401; Joined: Fri May 04, 2007 9:21 amFollowed by: 1 member; Thanked: 3 times

by NSNguyen » Mon Dec 10, 2007 9:05 am

Q17:
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 | Mon Dec 10, 2007 9:05 am

sujaysolanki: Master | Next Rank: 500 Posts; Posts: 214; Joined: Wed Nov 14, 2007 6:30 am; Thanked: 15 times

by sujaysolanki » Mon Dec 10, 2007 9:44 am

Put x = 2 y = 8 k comes to 18 ..just picking numbers which are divisible by 10 and 20

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