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Problems from Another Time

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

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?
There is a four-sided field whose eastern side measures 35 paces, its western side 45 paces, its southern side 25 paces and its northern side 15 paces. Find the area of this field.
A circle, a square and an equilateral triangle all have the same perimeter equal to 1 meter. Compare their areas.
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?
The sum of the two digits of a 2-digit number is 9. If 45 is subtracted from the number, the result will be expressed by the digits in reverse order. Find the number.
Now there are six-headed four legged animals and four-headed two-legged birds. Find the total number of animals and birds.
To find three quantities x.y, and z...
Discussion of 15th century French manuscript, with translation of its problems, including one with negative solutions
There are two numbers which are to each other as 5 and 6 and the sum of their squares is 2196. What are the numbers?
Seven men held equal shares in a grinding stone 5 feet in diameter. What part of the diameter should each grind away?

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