Homework Help Forum: 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.

• Math 213 Elementary Math - drwls, Friday, August 7, 2009 at 4:18pm

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

  
  

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