The average age of a c

Question

The average age of a class of 39 students is 15 years . If the age of the teacher be included, then the average increases by 3 months. Find the age of he teacher..

Options:

A . 35 years

B . 29 years

C . 28 years

D . 25 years

Answer: Option D

Sol. Total age of 39 persons = (39 x 15) years = 585 years.

Average age of 40 persons = 15 years 3 months = ` 61/4 ` years.

Total age of 40 persons = `(61/4 xx 40)` years = 610 years.

`:.` Age of the teacher = (610 - 585) years = 25 years.

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