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The average age of 36 students in a group is 14 years. When the teacher’s age is included in it, the average increases by one. The teacher’s age in years is
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- 31
- 51
- 36
- 50
- 31
Correct Option: B
Here , The average age of 36 students = 14 years.
Total age of 36 students = 36 × 14
Let teacher’s age be y years.
According to the question,
36 × 14 + y = 37 × 15
⇒ 504 + y = 555
⇒ y = 555 – 504 = 51 years
