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Problems from Another Time

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

On a day in spring a boy has gathered cherry blossoms under a cherry tree. Nearby a poet is reading some of his poems aloud. As he reads, the boy counts out the cherry blossoms, one blossom for each word of a poem.
Fibonacci gave a practical rule for approximating the area of an equilateral triangle.
Given four integers where if added together three at a time their sums are: 20, 22, 24, and 27. What are the integers?
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?
If I were to give 7 pennies to each beggar at my door, I would have 24 pennies left in my purse. How many beggars are there and how much money do I have?
Now there are six-headed four legged animals and four-headed two-legged birds. Find the total number of animals and birds.
A horse halving its speed every day runs 700 miles in 7 days.
How a translation of Peano's counterexample to the 'theorem' that a zero Wronskian implies linear dependence can help your differential equations students
Seven men held equal shares in a grinding stone 5 feet in diameter. What part of the diameter should each grind away?
Rabbits and pheasants are put in a basket.