In a class, the average age of 40 students is 12 years when teacher’s age is included to it, the average increases by 1. The age of teacher is :

In a class, the average age of 40 students is 12 years when teacher’

1.	In a class, the average age of 40 students is 12 years when teacher’s age is included to it, the average increases by 1. The age of teacher is :
A.	53 years
B.	51 years
C.	48 years
D.	68 years
Answer» B. 51 years

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In a class, the average age of 40 students is 12 years when teacher’s age is included to it, the average increases by 1. The age of teacher is :

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