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A Learning Portal from Recruitment India

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

A.

30 years

B.

33 years

C.

35 years

D.

28 years

Answer with explanation

Answer: Option BExplanation

Solution:

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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