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But What's in the Flasks?

Thirty flasks—10 full, 10 half-empty, and 10 completely empty—are to be divided among 3 sons so that flasks and contents should be shared equally. How may this be done?

Propositiones ad acuendos juvenes (Problems to Sharpen the Young), Alcuin of York, c. 800 CE

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"But What's in the Flasks?," Convergence (April 2004)