Question

The average age of 59 students of a class is 22 years. If the age of the teacher is also included, the average age of the whole group becomes 23 years. The age (in years) of the teacher is :

• A. 81
• B. 83
• C. 84
• D. 82

Answer 1

Answer:

D. 82

Average of 59 students = 22

Total age of students

$59 \times 22 = 1298$

New total including teacher

Total people = 60
Average = 23

$60 \times 23 = 1380$

Teacher’s age

$1380 - 1298 = 82$

Final Answer: 82 years