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प्रश्न
The average age of 80 boys in a class is 15. The average age of a group of 15 boys in the class is 16 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?
पर्याय
15.25
14
14.75
Cannot be determined
None of these
MCQ
बेरीज
उत्तर
Total age (sum) of all 80 students = 80 x 15 = 1200
Total age (sum) of 15 students = 15 x 16 = 240
Total age (sum) of 25 students = 25 x 14 = 350
Total age (sum) of remaining 40 students = 1200 – (240 + 350) = 610
Average of remaining 40 students = `610/40` = 15.25
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