Question

there were 24 student in a class . one of them who was 18 years old left the class and his place was filled up by a newcomer. if average of the class was thereby lowered by 1 month the age of newcomer is​

Answer 1

Answer:

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

Answer 2

Answer:

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