10 Stacks Of 10 Pennies One Is Fake | Canadian Coins

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i was asked a riddle and i cant crack it!!! so please help… 10 gold coins and 1 counterfeit?

there are 10 gold coins from that 1 is a counterfeit we don’t know if the fake one is heavier or lighter than the gold coins and you get only 3 readings on the scale to solve it.
P.S. all the coins look identical. the only difference is the fake one is either heavier or lighter than the original. and all the other 9 original coins weigh the same!
its not 12… Continue reading

3 comments - What do you think? Posted by admin - March 11, 2010 at 8:15 am

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Gold coin problem. It’s tricky and confusing.?

Suppose You have 5 stacks with 20 supposedly gold coins in each stack. Each authentic gold coin weighs 10 grams, but two of the stacks are composed of only counterfeit coins weighing 11 grams each. You are given a scale the weighs grams. Figure out a way to determine the counterfeit stacks in one weighing using the scale.… Continue reading

5 comments - What do you think? Posted by admin - February 6, 2010 at 8:16 am

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