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in a school the ratio of the number of the boys to the number of girls 4:5 when 100 girls leave the school the ratio becomes 6:7 find the number of boys in the schoo |
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Answer» Answer: Let number of boys = 4X and number of girls = 5X According to the question 4X / (5X - 100) = 6/7 ⇒ 28X = 6 ( 5X - 100 ) ⇒ 28X = 30X - 600 ⇒ 2X = 600 ∴ X = 600/2 = 300 ∴ Number of boys = 4X = 4 x 300 = 1200 |
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