You have 8 bricks, but one of them is lighter than the rest.
You have a balance you can only use twice.
How do you find the lighter brick?
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Answer: Put 3 and 3 on the balance, if it’s even, put the last 2 on the balance. If not even, put 2 of the last 3 on the balance. If the last 2 balance, it’s the 3rd brick!