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:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 82
Average age of 59 students = 22 → Total = 59 × 22 = 1298
Average with teacher = 23 for 60 people → Total = 60 × 23 = 1380
Teacher's age = 1380 - 1298 = 82 years