You have a barrel, filled to the top with water, which weighs 150 pounds.
What can you add to the barrel in order to make it lighter?
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Hint: Adding just one will be enough.
Can you tell what this rebus is?
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Hint: Say what you see.
Answer: Unfinished business.
Can you place ten coins into 5 rows, with each row containing 4 coins...
...without placing any coin on top of another coin?
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Hint: Try this with real coins.
Place the coins in the following arrangement: