Multiple choice

The average age of 40 students in a class is 15 years. If the age of teacher is also included, the average becomes 16 years. Find the age of teacher?

  1. 56 years

  2. 15 years

  3. 17 years

  4. 34 years

  5. None of these
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A Correct answer
Explanation

Total age of 40 students = 40 × 15 = 600 years. Let teacher's age be T. New total = 600 + T, new average = 16 for 41 people. (600 + T)/41 = 16, 600 + T = 656, T = 56 years.

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