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Problems from Another Time

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

There are two piles, one containing 9 gold coins, the other 11 silver coins.
Now there is a wall 5 feet thick and two rats tunnel from opposite sides.
Gun metal of a certain grade is composed of 16% tin and 84% copper. How much tin must be added to 410 lbs. of this gun metal to make a composition of 18% tin?
How a translation of Peano's counterexample to the 'theorem' that a zero Wronskian implies linear dependence can help your differential equations students
Now there are six-headed four legged animals and four-headed two-legged birds. Find the total number of animals and birds.
A tree 100 units high is 200 units distant from a well; from this tree one monkey climbs down and goes to the well...
Discussion of 15th century French manuscript, with translation of its problems, including one with negative solutions
Seven men held equal shares in a grinding stone 5 feet in diameter. What part of the diameter should each grind away?
What will the diameter of a sphere be, when its volume and surface area are expressed by the same number?
Given a pyramid 300 cubits high, with a square base 500 cubits to a side, determine the distance from the center of any side to the apex.