The average of 20 students is 12 years if the teacher’s…

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The average of 20 students is 12 years, if the teacher’s age is included, average increases by one. The age of the teacher is:

  1. A. 30 years
  2. B. 33 years
  3. C. 28 years
  4. D. 35 years

Answer: Option B

Here is complete explanation of The average of 20 students is 12 years if the teacher’s….

Solution(By ExamCraze Team)

Average of 20 students = 12 years
Total age of 20 students
= 20 × 12
= 240 years
When teacher included average become 13 years
Now, total age 20 students and teacher
= 13 × 21 = 273 years
∴ Age of teacher
= 273 - 240
= 33 years

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