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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 A.10B.12C.15D.18E.30
题目内容：
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
A.10
B.12
C.15
D.18
E.30
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
A.10
B.12
C.15
D.18
E.30
A.10
B.12
C.15
D.18
E.30
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