The boys and girls in a college are in the ratio 3 : 2 . If 20% of the boy and 25% of the girls are adults, the
percentage of students who are not adults :
Let the number of boys and girls be `3x` and `2x` respectively. Then
No. of students who are not adults = `(80/100 xx 3x) + (75/100 xx 2x)` = `((12x)/(5) + (3x)/(2))` = `(39x)/(10)`
`:.` Required percentage = `((39x)/(10) xx (1)/(5x) xx 100)`% = 78%.
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