Question:
The average age of 29 boys of a class is equal to 14 years. When the age of the class teacher is included, the average becomes 15 years. Find the age of the class teacher.
The average age of 29 boys of a class is equal to 14 years. When the age of the class teacher is included, the average becomes 15 years. Find the age of the class teacher.
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Use total = average × number to handle average-with-an-extra-person type questions.
Updated On: Aug 12, 2025
- 44 years
- 40 years
- 52 years
- 66 years
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The Correct Option is A
Solution and Explanation
Total age of 29 boys = 29 × 14 = 406 years.
With teacher included there are 30 people, average 15 ⇒ total = 30 × 15 = 450 years.
Teacher's age = 450 − 406 = 44 years.
Hence the correct answer is (a) 44 years.
With teacher included there are 30 people, average 15 ⇒ total = 30 × 15 = 450 years.
Teacher's age = 450 − 406 = 44 years.
Hence the correct answer is (a) 44 years.
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