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October 21, 2014

October 21, 2014

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

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 5:52pmYour subject is math.

- elementary -
**Reiny**, Saturday, October 31, 2009 at 6:06pmThink 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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