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The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases by 3 months. Find the age of the teacher.
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- 30 years
- 25 years
- 35 years
- 40 years
- 30 years
Correct Option: B
Given that , The average age of 39 students = 15 years
If the age of the teacher is included, then the average increases by 3 months , then
Age of teacher = 15 years + total increase = 15 years + (40 × 3) months
| Age of teacher = 15 + |  | 40 × 3 |  | years |
| 12 |
Hence , Age of teacher = (15 + 10) years = 25 years
