The famed International Mathematical Olympiad has been challenging students worldwide for over 40 years. Since the first competition in Romania in 1959 - with only seven countries participating - it has expanded to attract competitors from over 80 countries, representing all five continents. This third volume features every question from 1991-2004, along with comprehensive solutions and multiple answers where applicable. A fantastic selection of mathematical puzzles, this fully updated three-volume series will be of interest to serious mathematicians and enthusiasts alike. Istvan Reiman's compilation of logic puzzles and questions will tease the intellect of all those with a mathematical mind. Istvan Reiman was formerly Leader of the Chair of Geometry at the Budapest University of Technology. He has been guiding the Youth Mathematical Circle of the J Bolyai Mathematical Society and directing the preparation of Hungarian students for the annual International Maths Olympiad for 40 years.