Two odd numbers add up to an even one, and a third odd number makes it odd again. Three odd numbers can never come to 300.
A farmer has 300 pigs and wants them all slaughtered over three days, with an odd number killed each day. How many does he kill on each day?
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Try it with any three odd numbers you like.
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It can’t be done
Source: Alcuin of York (attributed), Propositiones ad Acuendos Juvenes, no. 43, c. 800