Mathematics

Mathematics, 15.02.2021 05:40, khoadominh2206

12. Each of the four balls weighs either 10 or 20 or 30 or 40 grams.
Which ball weighs 30 grams?

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12. Each of the four balls weighs either 10 or 20 or 30 or 40 grams.
Which ball weighs 30 gra...

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