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%
75%
78%
50%
A
80%
B
50%
C
78%
D
75%
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Solution
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Adult Boys=35×20=12
Adult Girls=25×25=10
∴ Percentage of the student who are not adult
=[100−(12+10)]%
=[100−22]%=78%
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