Robert Geretschlager & Gottfried Perz 
MATHEMATICAL NUGGETS FROM AUSTRIA [EPUB ebook] 
Selected Problems from the Styrian Mid-Secondary School Mathematics Competitions

This book is composed of the most interesting problems from a quarter century of regional mathematics competitions for students aged 11-14 in the province of Styria, Austria. The problems presented here range from pure puzzles to a more traditional mathematical type of question, but all are somehow special, posed with the intent of giving the reader something interesting to think about, with the promise of an entertaining moment of elucidation and enlightenment at the end.