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The average age of a class of 39 students is 15…

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The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases by 3 months. Find the age of the teacher.

  1. A. 30 years
  2. B. 25 years
  3. C. 35 years
  4. D. 40 years

Answer: Option B

Here is complete explanation of The average age of a class of 39 students is 15….

Solution(By ExamCraze Team)

Average age of the class = 15 years
Average age of the class including teacher = 15 years 3 months
Teacher's age
= 15 × 40 + $$frac{3}{12}$$ × 40 - 15 × 39
= 610 - 585
= 25 years

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