The average (arithmetic mean) of two numbers is 4x. If one of the numbers is y, ...【小站备考】

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The average (arithmetic mean) of two numbers is 4x. If one of the numbers is y, then the value of the other number is

A.x-4*y

B.4*x+4*y

C.8*x-4*y

D.4*y-8*x

E.8*x-y

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