the average age of 30 girls is 13 yr. the average of first 18 girls is 15 yr.

Question

the average age of 30 girls is 13 yr. the average of first 18 girls is 15 yr. find out the average age of remaining 12 girls.

Options:

A . 10 years

B . 13 years

C . 17 years

D . 19 years

Answer: Option A
Explanation :

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