In School A, 60% are boys and the number of girls in School B is 25% less than the number of boys in School A and the number of girls in School C is 60 more than that of School B and the total number of students in school B is 1300. Find the number of boys in School B, if the average number of girls in School A, B and C is 540.<\/p>\n\n\n\n
a) 760<\/strong><\/p>\n\n\n\n b) 720<\/p>\n\n\n\n c) 480<\/p>\n\n\n\n d) 540<\/p>\n\n\n\n e) None of these<\/p>\n\n\n\n Sol:<\/p>\n\n\n\n The number of boys in School A = 60x<\/p>\n\n\n\n Number of girls in School A = 40x<\/p>\n\n\n\n Number of girls in School B = 60x * 75\/100 = 45x<\/p>\n\n\n\n Number of girls in School C = 45x + 60<\/p>\n\n\n\n (40x + 45x + 45x + 60)\/3 = 540<\/p>\n\n\n\n 130x + 60 = 1620<\/p>\n\n\n\n 130x = 1560<\/p>\n\n\n\n x = 12<\/p>\n\n\n\n Number of boys in School B = 1300 \u2013 45 * 12 =<\/p>\n\n\n\n 1300 \u2013 540 = 760<\/p>\n","protected":false},"excerpt":{"rendered":" In School A, 60% are boys and the number of girls in School B is 25% less than the number of boys in School A and the number of girls in School C is 60 more than that of School B and the total number of students in school B is 1300. 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