Question

A school has 20 teachers, one of them retires at the age of 60 years and a new teacher replaces him, this change reduces the average age of the staff by 2 years, the age of new teacher is
A) 28 years
B) 25 years
C) 20 years
D) 18 years

Answer 1

Average is reduced by 2 yrs....

And, there are 20 teachers


So, Total change in age

= 40 yrs.....


The one who retired was 60 yrs old....


So, Age of new teacher

= 60 - 40

= 20 yrs.....