The average (arithmetic mean) of 8, j, 21, and 24 is k. The average of k, 25, an...【小站备考】

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The average (arithmetic mean) of 8, j, 21, and 24 is k. The average of k, 25, and 30 is 24. What is the value of j?

A.15

B.17

C.19

D.21

E.24

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