I will select a "best answer":
You have 12 coins which are identical in every way, except that one of them is counterfit in its weight, but you do not know which one it is or whether it is heavier or lighter than the others. (Assume, of course, that the difference is too small to tell just by holding it).
At your disposal you have a balance scale. Using this scale 3 times (no more), you must determine:
a) which coin is the fake
b) whether it is heavier or lighter than the others
Yes, it CAN be done - good luck!
2007-03-18
02:01:42
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2 answers
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asked by
blighmaster
3
in
Mathematics