If in a circle ABDC, circumscribe an equilateral triangle ABC; the straight line AD is equal to the sum of the two straight lines BD and DC: required a demonstration.

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

A cat sitting on a wall 4 cubits high saw a rat prowling 8 cubits from the foot of the wall;

A man and his wife drink a barrel of wine at different rates. Find the rate it takes both of them together to drink the wine.

Having been given the sum of two numbers,a, and the difference of their squares,b, find the numbers.

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.

Determine the greatest cylinder that can be inscribed in a given cone.

A square walled city measures 10 li on each side. At the center of each side is a gate. Two persons start walking from the center of the city.

The dimensions of a rectangular box in inches are expressed by three consecutive numbers. The surface of the box is 292 square inches. Find the dimensions.

Given two circle tangent at the point P with parallel diameters AB, CD, prove that APD and BPC are straight lines.