The average age of 54 students of a class is 37 years. If the age of the teacher is also included, the average age of the whole group becomes 38 years. The age (in years) of the teacher is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 92.
Average age of 54 students = 37 years
Total age of 54 students = 54 × 37 = 1998 years
Average age of 55 people (including teacher) = 38 years
Total age of 55 people = 55 × 38 = 2090 years
Age of teacher = 2090 - 1998 = 92 years