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26 May, 13:25

The ratio of boys to girls is 5 to 4. There are 80 boys

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  1. 26 May, 14:23
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    If you are trying to find the ratio of boys to girls if there are 80 boys then all you do is:

    1) Set up a proportion: 5/4 and 80/x

    2) Cross multiply and divide:

    5x = 80 (4)

    5x = 320

    x = 320/5

    x = 64

    So if the ratio of boys to girls is 5 to 4 and there are 80 boys, then there are 64 girls.
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