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The ratio of number of boys and girls in a school of 720 students is 7 : 5. How many more girls should be admitted to make the ratio 1 : 1 ?
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- 90
- 120
- 220
- 240
Correct Option: B
Boys : Girls = 7 : 5
| Number of boys = | × 720 = 420 | |
| 12 |
| Number of girls = | × 720 = 300 | |
| 12 |
Let x girls be admitted.
According to the question,
420 = 300 + x
⇒ x = 420 – 300 = 120
