The average age of 28 students of a class is 40 years. If the age of the teacher is also included, the average age of the whole group becomes 41 years. The age (in years) of the teacher is:
Given:
Number of students = 28
Average age of students = 40 years
Average age including teacher = 41 years
Total persons including teacher = 29
Formula Used:
Total Age = Average × Number of persons
Solution:
Total age of 28 students = 28 × 40 = 1120 years
Total age of students and teacher = 29 × 41 = 1189 years
Age of the teacher = 1189 − 1120 = 69 years
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