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elementary

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Think of a number.
Add 7.
Double the result.
Subtract 8.
Double the result.
Add 12.
Divide by 4.
Subtract 6.
Your answer will be the original number. Explain how this trick works.

  • elementary math - ,

    Your subject is math.

  • elementary - ,

    Think of a number.... x
    Add 7.... x+7
    Double the result..... 2x+14
    Subtract 8....2x+6
    Double the result.... 4x + 12
    Add 12. 4x + 24
    Divide by 4.... x + 6
    Subtract 6.... x

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