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The boys and girls in a collage are in ratio 3 : 2. If 20% of the boys and 25% of the girls are adults, the percentage of students who are not adults is ?
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- 58%
- 67.5%
- 78%
- 82.5%
Correct Option: C
Suppose boys = 3N and girls = 2N
Not adults = (80% of 3N) + (75% of 2N) = (12N/5 + 3N/2) = 39N/10
∴ Required percentage = (39N/10 / 1/5N) x 100 % = 78%
