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The average age of 30 students of a class is 14 years. When the teacher's age is included, the average becomes 15 years. What is the age of…

1648Medium DSSSB TGT Computer Science 0 replies 1 views

The average age of 30 students of a class is 14 years. When the teacher's age is included, the average becomes 15 years. What is the age of the teacher?

A40 years
B42 years
C46 years
D45 years

Correct answer: D

Explanation

Teacher's age = 31 × 15 − 30 × 14 = 465 − 420 = 45 years.

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