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The ratio of the number of boys and girls in a college is 7: 8. If the percentage increase in the number of boys and girls be 20% and 10% respectively, what will be the new ratio?

The ratio of the number of boys and girls in a college is 7: 8. If the percentage increase in the number of boys and girls be 20% and 10% respectively, what will be the new ratio? Correct Answer 21:22

Let, number of boys =7P,    number of girls = 8PAfter increase number of boys = 7P+(7P*20)/100                                                          = 7P+7P/5 = 42P/5After increase number of girls = 8P+(8P*10)/100                                                        = 8P+4P/5 = 44P/5So, the new ratio of boys : girls = 42P/5 : 44P/5                                                         = 42 : 44 = 21:22 (Ans)         

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