math

There are 42 student in a class 3/4 of the boys and 2/3 of the girls travel to school by bus. The total number of boys and girls who come to school by bus is 30. How many boys are there in the class?

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  1. b+g=42
    3/4 b + 2/3 g = 30

    g = 42-b, so

    3/4 b + 2/3 (42-b) = 30
    b = 24

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