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Math 213 Elementary Math

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20. 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.

  • Math 213 Elementary Math -

    If 20 is the answer, what is the question?
    20 is not a question

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