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The average age of 30 boys in a class is 10 years. If the age of their teacher is also included, the average increases by one year. The teacher’s age in years is
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- 38
- 40
- 30
- 41
- 38
Correct Option: D
Given that , The average age of 30 boys = 10 years
On including teacher , total increase = 31 × 1 = 31 years
Teacher’s age = The average age of 30 boys + total increase
∴ Teacher’s age = (10 + 31) years = 41 years
