The ratio of boys to girls is 3 to 7. If there are 20 more girls than boys, how many boys are there?

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  1. There are 17 boys

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  2. Not quite.

    b/g = 3/7
    g = b+20

    b = g-20
    = 7b/3 - 20
    4b/3 = 20
    b = 15

    check: 15/35 = 3/7

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