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Matt J

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12 balls part 2

Of the last 3 balls left, you don't have to cut one.. Then you would just have a ruined ball. Instead, just place one ball on each side of the weighing machine, while keeping one in your hand or off to the side. If the 2 balls on the machine are equal, then the one in you hand or off to the side weighs 9 grams, otherwise the one on the weighing machine that weighs less than the other weighs 9 grams.