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3/7 of a class are boys. What fraction of the class consists of girls if there are 28 girls, how many boys are there in the class.

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2 answers

  1. No response

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  2. Fraction of girls:

    1 - 3 / 7 = 7 / 7 - 3 / 7 = 4 / 7

    x = numbers of sudents

    there are 28 girls

    4 / 7 x = 28

    Multiply both sides by 7

    4 x = 196

    x = 196 / 4 = 49

    49 students there in the class.

    3 / 7 of 49 are boys

    3 • 49 / 7 = 21 boys

    OR

    boys / girls = 3 / 4

    3 • 28 / 4 = 21 boys

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