Question
In a class, the ratio of number of boys to that of girls
was 5:4 and total number of boys was 1125. When some more boys joined, the ratio became 6:5. Find the number of boys joined.Solution
Boys : Girls = 5:4 Number of girls = 4/5 × 1125 = 900 Let boys be added x. So, number of boys = 1125 + x According to the question, => (1125 + x)/900 = 6/5 => 1125 + x = 1080 => x = 45
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