If the average (arithmetic mean) of x, y and 15 is 9, and the average of x, 2*y ...【小站备考】

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If the average (arithmetic mean) of x, y and 15 is 9, and the average of x, 2*y and 2 is 7, then y =

A.5

B.6

C.7

D.8

E.9

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