The average (arithmetic mean) of four numbers is 4a + 16. When a fifth number is...【小站备考】

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The average (arithmetic mean) of four numbers is 4a + 16. When a fifth number is added, the average becomes 5*a + 20. The fifth number is

A.a-4

B.a+4

C.4*a+4

D.4*a+16

E.9*a+36

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