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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?

A21 : 22

B17 : 18

C8 : 9

DCannot be determined

Answer:

A. 21 : 22

Read Explanation:

Let the number of boys and girls be 70a and 80a respectively. Increased number of boys = 70a + 70a × 20/100 = 84a Increased number of girls = 80a + 80a × 10/100 = 88a New ratio of boys and girls = 84a : 88a ⇒ 21 : 22


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