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Two officers each have a company of men, the one has 40 less than the other.
In order to encourage his son in the study of arithmetic, a father agrees to pay him 8 pennies for every problem solved correctly and to charge him 5 pennies for each incorrect solution.
What will the diameter of a sphere be, when its volume and surface area are expressed by the same number?
An old Chinese general led his army to a river with a steep bank. Standing atop the bank, he held a stick 6 feet long perpendicular to himself.
Now there are 100 deers [being distributed] in a city. If one household has one deer there is a remainder...Find the number of households in the city.
Request from the editors.
Thirty flasks-10 full, 10 half-empty, and 10 completely empty- are to be divided among 3 sons so that flasks and contents should be shared equally. How may this be done?

We invite you to send us information about these photographs of 20th century mathematicians.

A ladder is placed perpendicular to the plane of the horizon, and in coincidence with the plane of an upright wall.
On Triangles, by Regiomontanus (Johannes M�ller) (1436-1476), written in 1464 but not published until 1533.