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Expert replies
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

:-/
:shock:
Please share your idea and your reasoning :D
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Source: — Problem Solving |

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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