Magic Beer Bottle

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Thats cool. Some kind of number trick to it. If you do it the way they tell you too it works every time but if you just pick one at random it is wrong.
 
Yep, and add the digits of any number, (except 0 to 9), together and subtract from the original: it is divisible by 9. The labels change and the same one is alway on 0,9,18,27,etc.
 
Yep, and add the digits of any number, (except 0 to 9), together and subtract from the original: it is divisible by 9. The labels change and the same one is alway on 0,9,18,27,etc.

Yep! This is an old trick that seems to come up again and again.
 
You guys beat me to it. Look beside 99 90 81 etc all the labels are the same. No matter what number you originally start with, it will end up being a multiple of nine.

Kind of like the webpage that has you pick a card,and then is able to "guess" which card you picked. Took me awhile to figure this one out...

http://urbanlegends.about.com/library/bl_card_trick1.htm
 
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