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The Size of A City

Author(s): 

A square walled city of unknown dimensions has four gates, one at the center of each side.  A tree stands 20 pu from the north gate.  One must walk 14 pu southward from the south gate, then turn west and walk 1775 pu before he can see the tree.  What are the dimensions of the city?

China, 100 BCE

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Dummy View - NOT TO BE DELETED