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total no.of children=80 the ratio of girls to boys=6:2 no.of girls=6x no.of boys=2x 6x+2x=80 8x=80,x=10 so,the actual no.of girls =6*x=60 and the no.of boys=2*x=20

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Let x be the number of girls. Let 80-x be the number of boys.

Girls:boys = 6:2 x:80-x = 6:2 x/80-x = 6/2 x/80-x = 3 x = 240 - 3x 4x = 240 x = 60 Number of girls = 60 Number of boys = 80-60 = 20