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Problems from Another Time

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

A tree is 20 feet tall and has a circumference of 3 feet. There is a vine that winds seven equally spaced times around the tree and reaches the top. What is the length of the vine?
Given the cats eye as shown. Let the radius of the eye be given by R. What is the area of the pupil?
Three hundred pigs are to be prepared for a feast.
A speculator bought stock at 25% below par and sold it at 20% above par. He gained $1560. How much did he invest?

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