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A carpenter has undertaken to build a house in 20 days. He takes on another man and says; "If we build the house together, we can accomplish the work in 8 days!" How long would it take this other man to build the house working alone?
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.
The dimensions of a rectangular box in inches are expressed by three consecutive numbers. The surface of the box is 292 square inches. Find the dimensions.

The author shows how teachers can use Leonhard Euler's original works in the classroom to explore Euler's famous polyhedral formula,
V + F = E + 2.

There are two piles, one containing 9 gold coins, the other 11 silver coins.
Essays on various aspects of mathematical thought by prominent mathematicians of the past century.
Three persons bought a sugar loaf in the form of a perfect cone 25"" high and agreed to divide it...what was the slant height of each one's share?
This book is a collection of mathematical ideas organized around the themes of infinity and the illumination of the nature of mathematical thought.
A number is required; that the square shall be equal to twice the cube.
The annual meeting of the HPM Americas Section will take place Friday, April 28 at 5:30 pm. in the Landmark 5
room of the Renaissance Grand Hotel in St. Louis.