math

The ratio of boys to girls in a class is 7:4. If there are 9 more boys than girls how many children are in the class?

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  1. If there are 7x boys and 4x girls, then
    7x = 4x+9
    solve for x, and then there are 11x children.

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  2. X girls and x+9 boys.
    (x+9)/x = 7/4
    4x+36 = 7x
    X = 12 girls.
    x+9 = 12+9 = 21 boys.
    Total = 12+21 =

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