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Problems from Another Time

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

Discussion of 15th century French manuscript, with translation of its problems, including one with negative solutions
The square of a certain number multiplied by itself and by 200 is 446,976. What is the number?
Find two numbers such that multiplying one by the other makes 8 and the sum of their squares is 27.
Suppose that for every 4 cows a farmer has, he should plow 1 acre of land, and allow 1 acre of pasture for every 3 cows; how many cows could he keep on 140 acres?
The cavity of our chimney is an upright parallelepiped, the diagonal of whose base is 60"; and the height of the lower side of the lintel above the plane of the floor is 40".
Find two numbers, x and y, such that their sum is 10 and x/y + y/x = 25
Given a number, take 1/3 of the number away from itself and add 2. If this result is multiplied by itself, it equals the number plus 24. What is the number?
What is the sum of the reciprocals of the triangular numbers?
If an equilateral triangle whose area is equal to 10,000 square feet be surrounded by a walk of uniform width, and equal to the area of the inscribed circle, what is the width of the walk?
Suppose the area of an equilateral triangle be 600. The sides are required.

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