Great Book of Math Puzzles

Entertaining book, not really the Great Book of Math as its title implies. You will find Over 200 mathematical teasers grouped in thirty separated parts, called "quizzes" in this book. All the solutions to the puzzles are provided at the end of the book.

Here is am example of what you can find in this book (20-1):

"A water lily doubles itself in size each day. From the time its first leaf appeared to the time when the surface of the pound was completely covered took forty days. How long did it take for the pond to be half covered?

Difficulty level ranges from easy t medium. If you like more challenging pure mathematical teasers and puzzles, you may want to try "Challenging mathematical teasers" by J. A. H. Hunter.