Multiple choice

The average age of 29 students in a class is 18 years. If the age of a teacher is included then the average increases by 1 then find the age of the teacher.

  1. 51 years

  2. 53 years

  3. 48 years

  4. 46 years

  5. None of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total age of 29 students = 29 × 18 = 522 years. After adding teacher, average becomes 19 for 30 people. New total = 30 × 19 = 570. Teacher's age = 570 - 522 = 48 years.