The average age of 40 students in a class is 15 years If the age of teacher is also included the ave...........

Quantitative Aptitude ( CCS) Average

The average age of 40 students in a class is 15 years. If the age of teacher is also included, the average becomes 16 years, find the age of the teacher.

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Explanation:

If teacher's age is 15 years, there is no change in the average.

But teacher has contributed 1 year to all the students along with maintaining his age at 16.
Age of teacher = Average age of all + Total increase in age
= 16 + (1 x 40 ) = 56 years

Hence, option 4 is the correct answer.