Question:The boys and girls in a collage are in the ratio `3 : 2`. If `20%` of the boys and `25%` of the girls are adults, the percentage of students who are not adults is : 

A ``58%` 
B `67.5%` 
C `78%` 
D `82.5%` 

+ Answer
C 

+ Explanation
Suppose boys `= 3x` and girls `= 2x`

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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