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You have 10 bags with 1000 coins each. ...........

+2 votes

You have 10 bags with 1000 coins each. In one of the bags, all coins are forgeries. A true coin weighs 1 gram; each counterfeit coin weighs 1.1 gram.
If you have an accurate scale, which you can use only once, how can you identify the bag with the forgeries? And what if you didn't know how many bags contained counterfeit coins?

posted Nov 8, 2014 by Ujjwal Mehra

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1 Answer

+1 vote

Dude.. We have only one bag with 1.1 gram coins...For this take 1 coin from first bag..then 2 coins from second bag ..and so on..
Now weight that and compare with is original Weight u will find which bag contain forgeries.

Example : let we taken coins 1 , 2,3,4,5,6,7,8,9,10
now u know that actual weight is 55 Grams but let say when u weight that it comes 55.2 gram than u can directly say that 2nd bag is with forgeries.

answer Nov 18, 2014 by Kshitij Maloo

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This puzzle goes a step further from the previous one.
You have eight bags, each of them containing 48 coins. Five of those bags contain only true coins, the rest of them contain fake coins. A fake coin weighs 1 gram less than a real coin. You have an accurate scale, with the precision of up to 1 gram.
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