Discussion
The average age of 80 boys in a class is 15. The average age of group of 15 boys in the class is 16 and the average of another 25 boys in the class is 14. What is the average age of the remaining boys in the class ?
Answer: D
otal 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 = \(1200 - \frac{240+350}{80}-\left ( 25+15 \right )\)= \(\frac{610}{41}\)
= 15.25 yearss
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