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Brain Teaser #15 -

toi are donné eight coins and told that one of them is counterfeit. The counterfeit one is slightly heavier than the other seven. Otherwise, the coins look identical. Using a simple balance scale, can toi determine which coin is counterfeit using the scale only once?
 Shadowrednblack posted il y a plus d’un an
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CassandraLopez said:
yes because it will be heavier than the others.
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posted il y a plus d’un an 
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toi sure? Remember, toi can only use the scale once!
Shadowrednblack posted il y a plus d’un an
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yes!!! xP
CassandraLopez posted il y a plus d’un an
CB4evaGiggles said:
I tricked you. It can't be done with just one try. But it can be done if toi use the scale twice. Weigh three coins with three other coins. If they're the same, then weigh the two remaining coins and the heavier one is the counterfeit. If one of the groups of three was heavier, weigh two of that group of three. If they're even, the third is the counterfeit. Otherwise, the heavier one is the counterfeit.
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posted il y a plus d’un an 
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*you tricked me
CB4evaGiggles posted il y a plus d’un an
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Ahh, I know what's going on now... XD
Shadowrednblack posted il y a plus d’un an
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lol, ik, thnx!!
CB4evaGiggles posted il y a plus d’un an
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