math

3 fourth of a class are boys. The girls are 24 less than the boys. How many pupils are in the class?

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  1. b/(b+g) = 3/4
    g = b-24

    b/(2b-24) = 3/4
    4b = 6b-72
    b = 36
    so, g=12

    making 48 pupils in all

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