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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

Answer:

C. 11 years

Read Explanation:

New average age of class=20×12+5×7/25 =240+35/25 = 11 years


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