If the average (arithmetic mean) of 6, 8, 10, and x is between 7 and 11 inclusiv...【小站备考】

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If the average (arithmetic mean) of 6, 8, 10, and x is between 7 and 11 inclusive, what is the greatest possible value of x?

A. 8

B.11

C.20

D.28

E.44

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