The average age of 25 students of a class is fourteen years. The average age of a group of 10 of the students is 11 years and that of another group of 7 of them is 15 years. What is the average age of the remaining students?.

8.2

10.6

16.87

14.5

Total age of remaining 8 students = (25 * 14) - (10*11 + 7*15)= 135 years. Required average = (135/8) = 16.87 years.

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