Aptitude - Ratio and Proportion - Discussion
Discussion Forum : Ratio and Proportion - General Questions (Q.No. 6)
6.
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?
Answer: Option
Explanation:
Originally, let the number of boys and girls in the college be 7x and 8x respectively.
Their increased number is (120% of 7x) and (110% of 8x).
 |
 |
120 | x 7x |  |
and | |
110 | x 8x | |
| 100 | 100 |
| |
42x | and | 44x |
| 5 | 5 |
 The required ratio = |
|
42x | : | 44x | |
= 21 : 22. |
| 5 | 5 |
Discussion:
61 comments Page 7 of 7.
Paras said:
3 weeks ago
Let's suppose.
Total 15* 10 = 150
Boys 70
And girls 80.
20% of boys = 14 + 70 = 84.
10% of girls = 80 + 10 = 88.
84:88 divided by 2.
And the Answer is 21:22.
Total 15* 10 = 150
Boys 70
And girls 80.
20% of boys = 14 + 70 = 84.
10% of girls = 80 + 10 = 88.
84:88 divided by 2.
And the Answer is 21:22.
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