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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

(a) 8.2 years

(b) 9.5 years

(c) 12.5 years

(d) 11 years



The average age of 20 boys in a class is 12 years. 5 new boys are admitted to the class whose avera..

Answer / mukherzee

( d ) 11 years

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