Asked by JJJ.Sara

Please help...

The ratio of the number of boys to that of girls in Class A is 2 : 3. The ratio of the number of girls who wear glasses to the number of girls who do not wear glassesis 1:3. If there are 12 more girls than boys, how many girls wear glasses?
Answered by Reiny
let the number of boys be 2x
let the number of girls be 3x
(notice boys:girls = 2x:3x = 2:3 )

given: 3x - 2x = 12
x = 12

so we know there were 24 boys and 36 girls

let the number of girls who wear glasses be y
let the number of girls who don't wear glasses be 3y

y + 3y = 36
4y = 36
y = 9

So 9 girls wear glasses
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