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The ratio of the number of boys and girls in a college is 3 : 2. If 20% of boys and 25% of girls are adults, the percentage of those students who are not adults, is
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- 58%
- 67.5%
- 78%
- 82.5%
Correct Option: C
Let the number of boys and girls in the college be 3k and 2k respectively.
| Number of minor boys = 3k × | = | |||
| 100 | 5 |
| Number of minor girls = 2k × | = | |||
| 100 | 2 |
| Total number of minor students = | + | |||
| 5 | 2 |
| Total number of minor students = | = | |||
| 10 | 10 |
| Required percentage = | × 100 = 78% | 10 × 5k |
(As total students = 3k + 2k = 5k)
