If the average (arithmetic mean) of x, y, and z is 20, which of t

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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

答案：E

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