Barrel Half Full

There is a barrel with no lid and some water in it. “This barrel is more than half full,” said Tom. “No it’s not,” say John. “It’s less than half full.” Without any measuring implements and without removing any water from the barrel, how can they easily determine who is correct?

Answer

They must tilt the barrel until the water reaches the rim of the barrel. If they can see the bottom of the barrel then it is less than half full.

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