The average age of 80 boys in a class is 15.The average age of a group of 15 boys in the class is16 and the average age of another 25 boys in the class is 14 . what is the average age of the remaining boys in the class?
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Total ages of 80 boys = 15 x 80 = 1200 yrs.
Total age of 16 boys = 15 x 16 = 240 yrs
Total age of 25 boys = 14 x 25 = 350 yrs.
Average age of remaining boys = 1200 - (240+350) / 80 - (25+15) = 610/41 = 15.25 yrs.
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