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29 January, 23:40

One number is 8 times another. their product is 40 times their sum. find the numbers.

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  1. 30 January, 00:04
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    X = 8y

    xy = 40 (x + y)

    xy = 40x + 40y

    8y (y) = 40 (8y) + 40y

    8y^2 - 32y - 40y = 0

    8y^2 = 72

    y^2 = 9

    y = 3, y = - 3

    x = 8 (3)

    x = 24

    y = 3
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