Read-a-thonMath brain teasers require computations to solve.
This year there has been a 10% increase in participation at the Summit School Annual Read-A-Thon. The school population has remained the same. Last year, 80% of the school's 550 students were involved in the event. Of the students who participated this year, 38 read just 1 or 2 books, 83 read 3 to 5 books, 172 read 6 to 9 books, and the rest read 10 or more books.
What percentage (to the nearest whole percent) of the participating students this year read more than 5 books for the Read-A-Thon?
AnswerIf 80% of the school participated in last year's Read-A-Thon, this 80% represents 550 x 0.8 = 440 students. If this year's participation shows a 10% increase on last year's, this means that 440 x 1.1 = 484 students took part. Of these, the number who read more than 5 books was 484 - (38 + 83) = 363. So, these readers were 100 x 363/484 = 75% of the participants.
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