Q: The average of 21 number is 66. The average of first 9 numbers is 63.7 and the average of last 13 numbers is 69.9. If 9th number is put out, what is the average of remaining number?
A.
64
B.
63
C.
64.5
D.
63.5
Correct Answer:
Option C -
Explanations:
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