A railway train strikes a snowdrift which creates a constant resistance. How long does it take the snow to stop the train?

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

It is required to determine whether 30 horses can be put into 7 stalls; so that in every stall there may be, either a single horse, or an odd number of horses.

One military horse cannot pull a load of 40 dan; neither can 2 ordinary horses, nor can three inferior horses.

One says that 10 garments were purchased by two men at a price of 72 dirhams. The garments varied in value. The price of each garment of one man is 3 dirhams more than the price for each garment of the other. How many garments did each man buy?

Three men have a pile of money, their shares being 1/2, 1/3 and 1/6. Each man takes some money from the pile until nothing is left.

There are two columns in the ruins of Persepolis left standing upright; one is 70 ft. above the plane, and the other 50 ft;

A person has a circular yard that is 150 ft. in diameter, and wishes a walk of equal width made round it within the fence...

If 12 cattle eat up 3 1/3 acres of meadow in 4 weeks and 21 cattle eat up 10 acres of exactly similar meadow in 9 weeks, how many cattle shall eat up 36 acres in 18 weeks? (Hint: The grass continues to grow.)

The authors recount the 'great tale' of Napier's and Burgi's parallel development of logarithms and urge you to use it in class.

If a ball 6 inches in diameter weighs 32 lbs, what will be the weight of a ball 3 inches in diameter?