The average of 15 numbers is 18. The average of first 8 is 19 and that last 8 is 17, then the 8th number is
The average of 15 numbers is 18. The average of first 8 is 19 and that last 8 is 17, then the 8th number is
(A) 15
(B) 16
(C) 18
(D) 20
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