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March 26, 2017

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Decrease a number by 5, divide the result by 2, then add 17 and multiply by 5. If the final result is 100, with what number did you start?

  • math - ,

    [( x-5)/2 + 17] * 5 = 100

    Divide both sides by 5.

    (x - 5)/2 + 17 = 20

    Subtract 17 from both sides.

    (x - 5)/2 = 3

    Multiply both sides by 2.

    x - 5 = 6

    Add 5 to both sides.

    x = 11

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