The average age of 40 students of a class is 15 years. If the age of the teacher is also included, the average age of the whole group becomes 16 years. The age (in years) of the teacher is:
Given:
Average age of 40 students = 15 years.
Average age of 40 students and 1 teacher = 16 years.
Formula Used:
Total sum = Average Number of terms
Solution:
Total age of 40 students ;
= 15 40 = 600 years
Total age of 40 students and 1 teacher ;
= 41 16 = 656 years
Then,
Teacher's age = 656 - 600 = 56 years
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