The average age of 24 boys and their teacher is 15 years. When the teacher's age is excluded, the average age decreases by 1 year. The age of the teacher is :

A. 38 years

B. 39 years

C. 40 years

D. 41 years

Answer: Option B

Solution(By Examveda Team)

The total age of 24 boys and teacher is
= 25 × 15
= 375 years
Let the teacher's age = x years
According to the question,
25 × 15 = 24 × 14 + x
375 = 336 + x
x = 39 years