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17 November, 19:43

In a class of 42 students, the number of boys is 2/5 of the girls. How many boys and girls are there?

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  1. 17 November, 23:42
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    B + g = 42

    b = 2/5g

    2/5g + g = 42

    2/5g + 5/5g = 42

    7/5g = 42

    g = 42 / (7/5)

    g = 42 * 5/7

    g = 210/7

    g = 30 < = = there are 30 girls

    b = 2/5g

    b = 2/5 (30)

    b = 60/5

    b = 12 < = = = there are 12 boys
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