The average age of 6 students is 12 years. If the teacher's age is included, the average becomes 15 years. What is the teacher's age? MCQ with Answer and Explanation

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The average age of 6 students is 12 years. If the teacher's age is included, the average becomes 15 years. What is the teacher's age?

A. 36

B. 30

C. 27

D. 33

Answer: Option D

Solution (By JKExamLibrary)

Sum of 6 students' ages = 6×12=72. Sum of 7 persons = 7×15=105. Teacher's age = 105-72=33.

This question belongs to: Maths Average

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