Balance Scale
A look at what is currently available on eBay
 50kg DIGITAL HANGING SCALE Balance LUGGAGE FISHING US $.99 
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 ANTIQUE LOOK BRASS NAUTICAL WEIGHING BALANCE SCALE US $22.99
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 BRASS NAUTICAL WEIGHING BALANCE SCALE VINTAGE LOOK US $19.99
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 ANTIQUE LOOK BRASS NAUTICAL WEIGHING BALANCE SCALE US $.99
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 BRASS NAUTICAL WEIGHING BALANCE SCALE VINTAGE LOOK US $.99
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 BRASS NAUTICAL WEIGHING BALANCE SCALE VINTAGE LOOK 1 US $.99
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 1000g x 0.1g DIGITAL Weigh SCALE Balance JEWELRY Pocket US $8.80
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 0.1-1000g Mini Electronic Digital Balance Weight Scale US $6.50
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Using a balance scale, what's the least number of times you need to use it in order to find the "false" coin?
(BRAIN TEASER)
You're given nine coins that look identical but aren't. Eight of them are made of gold. the ninth one is made of a diffrent, lighter metal. Using a balance scale, what's the least number of times you need to use it in order to find the "false" coin?
(BRAIN TEASER)
If you are lucky, the least number of times would be ONE (if by chance you select the non-gold coin to compare with a gold coin, you will know immediately which one is lighter). I think your question wants to know the MAXIMUM number of times you would need to use the scale; in that case it would be FOUR (if by chance the first four pairs of coins you pick up and measure happen to be the 8 gold coins, which would obviously balance out) - which means the leftover coin would HAVE to be the non-gold one, no weighing necessary 
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April 30th, 2005 in
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