If the average (arithmetic mean) of x, y, and z is 20, which of the following is...【小站备考】

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If the average (arithmetic mean) of x, y, and z is 20, which of the following is the value of z in terms of x and y?

A.20 - x - y

B.20 + x + y

C.40 - x - y

D.40 + x + y

E.60 - x - y

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