Discuss Forum
1. 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?
- A. 8:9
- B. 8:9
- C. 8:9
- D. 8:9
Answer: Option C
Explanation:
Let, number of boys =7P, number of girls = 8P
After increase number of boys = 7P+(7P*20)/100
= 7P+7P/5 = 42P/5
After increase number of girls = 8P+(8P*10)/100
= 8P+4P/5 = 44P/5
So, the new ratio of boys : girls = 42P/5 : 44P/5
= 42 : 44 = 21:22 (Ans)
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