Question

the average age of 24 boys and their teacher is 15 years when the teachers age is excluded the average age decreased by 1 year the age of the teacher is?

Answer 1

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Answer 2

Here is your answer .........

Avg of boys when teacher included = (24+1)*15 = 375
Avg of boys when teacher is excluded = 24 * 14 = 336
( Because in Question, given that average is decreased by 1 when teacher is excluded) .
So age of Teacher = 375-336 = 39.

Hope it helps you.........