The boys and girls in the college are in the ratio $3 : 2$ . If $20 %$ of the boys and $25 %$ of the girls are adults, what is the percentage of students who are not adult?

80 %

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75 %

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78 %

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50 %

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Solution

The correct option is C $78 %$
Adult Boys $= \frac{3}{5} \times 20 = 12$

Adult Girls $= \frac{2}{5} \times 25 = 10$
$∴$ Percentage of the student who are not adult
$= [100 - (12 + 10)] %$
$= [100 - 22] % = 78 %$

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The boys and girls in the college are in the ratio 3:2. If 20% of the boys and 25% of the girls are adults, what is the percentage of students who are not adult?

The correct option is C 78%Adult Boys=35×20=12Adult Girls=25×25=10∴ Percentage of the student who are not adult=[100−(12+10)]%=[100−22]%=78%

The boys and girls in the college are in the ratio $3 : 2$ . If $20 %$ of the boys and $25 %$ of the girls are adults, what is the percentage of students who are not adult?

The correct option is C $78 %$
Adult Boys $= \frac{3}{5} \times 20 = 12$

Adult Girls $= \frac{2}{5} \times 25 = 10$
$∴$ Percentage of the student who are not adult
$= [100 - (12 + 10)] %$
$= [100 - 22] % = 78 %$