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Problems from Another Time

Individual problems from throughout mathematics history, as well as articles that include problem sets for students.

In a right triangle, the hypotenuse is 9.434 and the sum of the sides around the right angle is 13. Find the lengths of the sides around the right angle.
What is the sum of the reciprocals of the triangular numbers?
Four men already having denari found a purse of denari; each man has a different amount of denari before they found the purse. Find out how much denari each man has.

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