the average age of all the students of a class is 15 years. the average age of

Question

the average age of all the students of a class is 15 years. the average age of the boys of the class is 18 years, and that of the girls is 12 years. if the number of girls in the class is 21, then wha

Options:

A . 20

B . 21

C . 22

D . 23

Answer: Option B
Explanation :

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