Multiple choice

The average of 40 boys of a class is equal to 15 yrs. When the age of the class teacher is included, the average becomes 16 yrs. Find the age of the class teacher.

  1. 45 years

  2. 56 years

  3. 30 years

  4. 22 years

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total ages of 40 boys = 15 x 40 = 600 years. Total ages when class teacher is included = 16 x 41 = 656 years Age of class teacher = 656 – 600 = 56 years.

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