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Problems from Another Time

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

Make of 10 three parts such that one part multiplied by 3 makes as much as the other multiplied by 4 and as the other multiplied by 5.
Discussion of 15th century French manuscript, with translation of its problems, including one with negative solutions
Find two numbers such that multiplying one by the other makes 8 and the sum of their squares is 27.
X, Y and Z hired a pasture for the season for $90.00. Each has a different number of mules and are on the pasture for a different number of days. How much is each to pay?
A horse, halving its speed each day, travels 700 miles in 7 days. How far does it travel each day?
Find two numbers, x and y, such that their sum is 10 and x/y + y/x = 25
A rifle ball is fired through a three-inch plank, the resistance of which causes an unknown constant retardation of its velocity.
What is the sum of the reciprocals of the triangular numbers?
As for a square piece of land that amounts to 100 square cubits, if it is said to you, "Cause it to make a piece of land that amounts to 100 square cubits that is round," what is the required diameter?
A castle has n rooms each of which has 7 samurai in it.