Homework Help Forum: elementary

Posted by Mary on Saturday, October 31, 2009 at 5:38pm.

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 - Ms. Sue, Saturday, October 31, 2009 at 5:52pm

  Your subject is math.

  
  

• elementary - Reiny, Saturday, October 31, 2009 at 6:06pm

  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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