The average age of 20 boys in a class is 12 years. 5 new boys are admitted to the class whose average age is 7 years. The average age of the boys in the class becomes
A9.5 years
B8.2 years
C11 years
D12.5 years
A9.5 years
B8.2 years
C11 years
D12.5 years
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