
Vicar:- "It's funny, but that number is the sum of the squares of the ages of my cousin's two daughters"
Virger:-"I can't tell you their ages uniquely. Are they the same age?"
Vicar:-"If I was to tell you that, you'd be able to do the problem, so I'm not telling you."
Virger:-"Aha Vicar, now I know uniquely" and he tells the Vicar the ages of the cousin's two daughters.
When was the church built?
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credit David W Masser, Nottingham, 1970s.

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