Question

the ratio of boy and girls attending a school assembly is 7 8 if there are 640 girls in the assembly , how many boys are there ??

Answer 1

Let the ratios of girls and boys be 7x and 8x.
ACQ,
8x = 640
x = 80

Therefore, no. Of boys = 7x
= 7*80
=560.

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Answer 2

let the no. of girls be 8x and no. of boys attending the asasembly be 7x.
Now, 8x=640
x=80
7x=7×80= 560.
therefore no. of boys attending the assembly are 560.