Question

there were 24 studentgs in a class. one of them who was 18 years old left the class and his place was filled up by a new comer. if the avarage of the class was there by lowered by 1 month the age of new comer is ???.. ?

Answer 1

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Let the age of new comer be x,

Average age of class decreased by 1 month

$= \frac{1}{12} \: years$

Difference of replacement = total students in class × age decreased

$= > 24 \times \frac{1}{12} = 18 - x \\ \\ = > 2 = 18 - x \\ \\ = > x = 16 \: years$

The age of the new comer is 16 years

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Answer 2

Age decreased-1/12 years

Duff of replacement - total students*age decreased

=24*1/2
=18-x

2=18-x
X=16

Age=16 years