Multiple choice

The average age of 65 boys of a class is 14 years. In which, average age of 20 boys is 14 years and average age of 15 other boys is 12 years. Find the average age of remaining boys.

  1. 16 years

  2. 13 years

  3. 17 years

  4. 15 years

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

Total age of 65 boys = 65 × 14 = 910 years. Age of 20 boys = 20 × 14 = 280 years. Age of 15 boys = 15 × 12 = 180 years. Age of remaining 30 boys = 910 - 280 - 180 = 450 years. Average age of remaining boys = 450/30 = 15 years.

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