the ratio of girls and boys attending a school is 7:8. If there are 640 boys in the school, how many girls are there?
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given ,
ratio of girls and boys is 7:8 and no. of boys attending school is 640.
let no. of boys be 8x
therefore, 8x=640
x=640/8
x=80
now are in the ratio of 7
so, no of girls =7x
7(80) (because x=20 solved above)
=560
so, no. of girls = 560
ratio of girls and boys is 7:8 and no. of boys attending school is 640.
let no. of boys be 8x
therefore, 8x=640
x=640/8
x=80
now are in the ratio of 7
so, no of girls =7x
7(80) (because x=20 solved above)
=560
so, no. of girls = 560
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