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In ancient Rome they used the following units of length:
5 pedes = 1 passus,
125 passus = 1 stadium.
The atrium (courtyard) of Marcus' home was a square with each side 50 pedes long.
How many times did Marcus have to walk round his atrium to complete his daily exercise of 8 stadia?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.