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PS: Equations

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PS: Equations

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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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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