Henry Ernest Dudeney/Puzzles and Curious Problems/244 - Sharing a Grindstone

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Puzzles and Curious Problems by Henry Ernest Dudeney: $244$

Sharing a Grindstone
Three men bought a grindstone $20$ inches in diameter.
How much must each grind off so as to share the stone equally,
making an allowance of $4$ inches off the diameter as waste for the aperture?
We are not concerned with the unequal value of the shares for practical use --
only with the actual equal quantity of stone each receives.


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