The average age of 25 students of a class is 16 years. If the age of the class teacher is included, the average increases by 1. Find the age of the class teacher.

40 years
38 years
36 years
42 years

Correct answer: 42 years

Solution

Sum of ages of 25 students = 25 × 16 = 400. New average with teacher = 17, new count = 26. New total = 26 × 17 = 442. Teacher's age = 442 − 400 = 42 years.

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