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Problems from Another Time

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

Perpendicular Curves
Show that the curves x2 - y2 = a2 and 2 xy = b2 cross at right angles.
A Hole in One?
A barrel has various holes in it. The first hole empties the barrel in three days...
Out to Pasture 2
X, Y and Z hired a pasture for the season for $90.00. Each has a different number of mules and are on the pasture for a different number of days. How much is each to pay?

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