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the ratio of the number of boys to the number of girls in a class is 5:4. if there are 15 boys, how many girls are there

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  1. b = number of boys

    g = number of girls

    The ratio of the number of boys to the number of girls in a class is 5:4 means:

    b / g = 5 / 4

    Cross multiply

    4 b = 5 g

    Divide both sides by 5

    4 / 5 b = g

    g = 4 / 5 b = 0.8 b = 0.8 ∙ 15 = 12

    Check results:

    b / g = 15 / 12 = 3 ∙ 5 / 3 ∙ 4 = 5 / 4

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  2. Answer is 12

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