Question
In a class, the ratio of number of boys to that of girls
was 7:6 and total number of boys was 1960. When some more boys joined, the ratio became 8:7. Find the number of boys joined.Solution
Boys: Girls = 7:6 Number of girls = 6/7 × 1960 = 1680 Let boys be added x. So, number of boys = 1960 + x According to the question, => (1960 + x)/1680 = 8/7 => 1960 + x = 1920 => x = 40
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