The average age of 24 boys and their teacher is 15…

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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 :

  1. A. 38 years
  2. B. 39 years
  3. C. 40 years
  4. D. 41 years

Answer: Option B

Here is complete explanation of The average age of 24 boys and their teacher is 15….

Solution(By ExamCraze Team)

The total age of 24 boys and teacher is
= 25 × 15
= 375 years
Let the teacher's age = x years
According to the question,
25 × 15 = 24 × 14 + x
375 = 336 + x
x = 39 years

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