The average age of 30 students is 9 years If the…

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The average age of 30 students is 9 years. If the age of their teacher is included, the average age becomes 10 years. The age of the teacher (in years) is :

  1. A. 27
  2. B. 31
  3. C. 35
  4. D. 40

Answer: Option D

Here is complete explanation of The average age of 30 students is 9 years If the….

Solution(By ExamCraze Team)

Let the age of teacher = x years
According to the question,
30 × 9 + x = 31 × 10
270 + x = 310
x = 40 years

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