in a class, the average age of 30 boys is 13 years and the average of 20 girls

Question

in a class, the average age of 30 boys is 13 years and the average of 20 girls is 12 years. what is the average age of the whole class?

Options:

A . 11.8 Years

B . 12.2 Years

C . 12.4 Years

D . 12.6 Years

Answer: Option D
Explanation :

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