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The average age of 80 boys in a class is 15 years. The average age of a group of 15 boys in the class is 16 years and the average age of another 25 boys in the class is 14 years. What is the average age of the remaining boys in the class?

The average age of 80 boys in a class is 15 years. The average age of a group of 15 boys in the class is 16 years and the average age of another 25 boys in the class is 14 years. What is the average age of the remaining boys in the class? Correct Answer 15.25 years

Total sum of age of 80 students of the class = 15 X 80 = 1200 years 15 students → 15 X 16 = 240 years 25 students → 25 X 14 = 350 years Sum of 40 students = 590 years Total age of remaining 40 students = 1200 – 590 = 610 So, average age = 15.25 years

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