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The Time It Takes To Eat a Goat

A lion can eat a goat in 2 days, a wolf can eat it in 3 days, and a fox can eat it in 5 days. How long would ut take all these animals together to eat the goat?

Trattato di matematica (Ms. Ricc 2669), Filippo Calandri, c. 1475

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"The Time It Takes To Eat a Goat," Convergence (December 2011)