Challenging Mathematical Teasers

If you are bored with the simple problems you usually find in books on recreational mathematics, you will be very pleased with the 100 mathematical teasers on this book. Here an example (teaser 32): "I am bored, give me something to do", said Joe "And what's the time anyway?". Ben glanced at his watch and did some quick figuring. "When I checked my watch this morning" he replied, "the hour hand was exactly where the minute hand is now, and the minute hand was one division before where the hour hand is now." "You mean minute division?" Joe asked. "That's right", Ben told him. "And both hands are exactly at minute divisions now." What was the time? Try this mathematical puzzle only if you like challenges, and if you liked this one, you will definitively love this book.