Brainteaser: Two Jugs

(Image credit: Flickr user Bill Rogers)

You have two plastic jugs filled with water. How can you put all the water into a barrel, without using the jugs or any dividers, and still tell which water came from which jug?

When you are ready for the answer, continue reading.


Highlight here for the answer: Freeze them first. Take the ice blocks out of the jugs and put them in the barrel. You will be able to tell which (frozen) water came from which jug. 

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First off, "water" is the common name for the chemical compound H2O. Ice is still water; it's still H2O; it's just another name for water in a solid state.

And just because there's no specific name for "molten steel" does not mean that the liquid form is somehow not still made of steel.

"Dry Ice" is a name for the solid form of carbon dioxide. But it's still carbon dioxide.

Let me put it this way: If I offered you $10,000 to bring me a jug of water, and you brought me jug full of ice, would you be entitled to the $10,000?
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I don't like this solution. First, how are you supposed to pour ice out of the jug? Second, I challenge anyone to examine two blocks of ice and identify which came from which jug. I suggest that you should pour one jug into the barrel, allow the barrel to freeze, and then pour the second jug's contents in.
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