February 25, 2017

Homework Help: Math 213 Elementary Math

Posted by Shay on Friday, August 7, 2009 at 4:05pm.

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.

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