The average age of 24 boys and their teacher is 15 years. When the teacher's age

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The average age of 24 boys and their teacher is 15 years. When the teacher's age is excluded, the average age decreases by 1 year. The age of the teacher is :

Options:

A . 38 years

B . 39 years

C . 40 years

D . 41 years

Answer: Option B

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