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#4
10-20-2006, 03:11 PM
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Re: BRAIN TEASERS THREAD
[ QUOTE ]
RIDDLE #2 - DIFFICULTY RATING 8.5/10 You have 12 coins, 11 weigh the exact same amount but one (you don't know which) is of a different weight (you also don't know whether its heaver or lighter. you have a scale, using 3 weighings figure out which coin is the odd one and whether it is heavier or lighter. [/ QUOTE ] Is this a scale where you put a coin on it and it gives you a numerical weight of that coin? Or is it a scale where you compare two items by placing them in different plates and watching which way the bar is tipped (a balance scale)? I am assuming the latter, but I just wanted to be clear. Also, where did you get this rating system? 
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