Question

45. The average age of 20 students of a class
is 15 years, if the teacher is also
included, it becomes an average of 16
years, then what is the age of the teacher-
(A)35
(B) 36
(D) 40
(C)41​

Answer 1

Answer:

Let the sum of ages of all 20 students be x and the age of teacher be y.

So, (x+y)/21 = 16

Also, x/20 = 15

So, x = 300

So, 300 + y = 16*21

So, y = 36

So, age of teacher is 36 years