The famed International Mathematical Olympiad has been challenging students worldwide for over forty years. The first competition was held in Romania in 1959 with seven countries participating. It has since expanded to attract competitors from over eighty countries, representing all five continents. This third volume features every question set 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.