One out of 9 otherwise identical balls is overweight. How can it be identified after 2 weighings?

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What do you call a tavern of blackbirds?

What is shaped like a box, has no feet, and runs up and down?

What can hold a car but can’t lift a feather?

My first is high, My second damp, My whole a tie, A writer’s cramp

I’m not clothes but I cover your body; The more I’m used, the thinner I grow. What am I?

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One out of 9 otherwise identical balls is overweight. How can it be identified after 2 weighings?

Answer: Weigh a group of 3 balls against another group of 3, then you'll know which group of 3 contains the heavy ball. Pick 2 balls from that group and weigh one against the other.

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My first is high, My second damp, My whole a tie, A writer’s cramp

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