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Posted by mel on Thursday, January 10, 2013 at 1:39am.

there are 3 boys for every 4 girls.how many are boys in a class of 42?

3 + 4 = 7 42 / 7 = 6 Boys : 6 * 3 = 18 Girls : 4 * 6 = 24

let the number of boys be 3x and the number of girls be 4x 2x+4x = 42 7x=42 x=6 so we have 3x or 18 boys and 4x or 24 girls.

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