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Let the total number of boys be x. and the total number of girls be y. The total number of books boys have = 120x The total number of books the girls have = 90y If each of the boy have read 5 books, then the remaining number of unread books = 120x – 5x = 115x The sum of the all the books = 100(x + y) = 115x + 90y 2y = 3x x : y = 2 : 3 Required % = (2/5) × 100 = 40%
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