Three equal circumferences with radii 6" are tangent to each other. Compute the area enclosed between them.

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

How a translation of Peano's counterexample to the 'theorem' that a zero Wronskian implies linear dependence can help your differential equations students

There is a mound of earth in the shape of a frustum of a cone.

A boy gives 11 coins of equal denomination to a man, and the man finds that their total value in yen is 4 less than his age.

There were two men, of whom the first had 3 small loaves of bread and the other, 2.

Discussion of 15th century French manuscript, with translation of its problems, including one with negative solutions

A gentleman has a garden of rectangular form and wants to construct a walk of equal width half way round to take up half the garden. What must be the width of this walk?

What proportions of sugar at 8 cents, 10 cents and 14 cents per pound, will compose a mixture worth 12 cents per pound?

Fibonacci gave a practical rule for approximating the area of an equilateral triangle.

A man bought a number of sheep for $225; 10 of them having died, he sold 4/5 of the remainder for the same cost and received $150 for them. How many did he buy?