The boys and girls in a college are in the ratio 3 is to 2 if 20% of the boys and 25% of the girls wear spectacles find the percentage of students who don't wear spectacles
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let total students will be 100 divide it in 3:2 =60/40
20 % 60=12 boys adult
25 % 40= 10girls adults
total adults = 22
no of students =100
100-22=78
78% are non adult
let 3x and 2x be the no. of boys and girls than we get total students 5x now
20% of boys and 50% of girls are adult than we get total=5x- (20% of 3x + 50% of 2x) =1.1x
1.1x*100/5x=22%(total adults)
total non adults will be 78%
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