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
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Answer Posted / mukherzee
( d ) 11 years
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