Suppose General [George] Washington had 800 men and was supplied with provisions to last 2 months but he needed to feed his army for 7 months.

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

Two ants are 100 paces apart, crawling back and forth along the same path. The first goes 1/3 pace forward a day and returns 1/4 pace; the other goes forward 1/5 pace and returns 1/6 pace. How many days before the first ant overtakes the second?

Show that the curves x2 - y2 = a2 and 2 xy = b2 cross at right angles.

Suppose a man had put out one cent at compound interest in 1620, what would have been the amount in 1824, allowing it to double once in 12 years?

Two men have a certain amount of money. The first says to the second, "If you give me 5 denari, I will have 7 times what you have left."

A circle, a square and an equilateral triangle all have the same perimeter equal to 1 meter. Compare their areas.

If I were to give 7 pennies to each beggar at my door, I would have 24 pennies left in my purse. How many beggars are there and how much money do I have?

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?

A horse halving its speed every day runs 700 miles in 7 days.

Now there are six-headed four legged animals and four-headed two-legged birds. Find the total number of animals and birds.