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10 December, 19:11

Twice a number decreased by 20 is 50.

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  1. 10 December, 19:20
    0
    The number is 35.

    Step-by-step explanation:

    Let the number be x

    Twice the number: 2*x = 2x

    Twice the number decreased by 20: 2x - 20

    2x - 20 = 50

    Add 20 to both sides

    2x - 20 + 20 = 50 + 20

    2x = 70

    Divide both sides by 2

    2x/2 = 70/2

    x = 35
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