Correct Solutions by,
- Toshihiro Shimizu Kawasaki, Japan
- Choi Min Kyu South Korea
- Mümtaz Ulaş Keskin Erciyes University
- Vedat Deveci İstanbul
- Albert Stadler Herrliberg, Switzerland
- Mustafa Burak Topal Bilkent University
- Deniz Can Karaçelebi Çiçekliköy 50. Yıl Fen ve Teknoloji Lisesi
- Cüneyd Öztürk Bilkent University
- Henrik Aberg Gothenburg, Sweden
- Paolo Perfetti Universite degli studi di Tor Vergata Rome, Italy
- Deniz Cemal Yılmazsoy
- Çınar Eren Arslan Koç University
- Haruhisa Oda Tokyo, Japan
- Alex Chiu United Kingdom
- Roger Bengtsson Lund, Sweden
- Selim Halykov Saparmurat Turkmenbashy Specialized Comprehensive School Türkmenistan
- Çağan Herek Bilkent University
- Hüseyin Ege Olcay Bilkent University
- Jurgen Weith University of Applied Sciences Wurzburg-Schweinfurt, Germany
- Muhammetmyrat Gochmyradov Turkmen State Instıtute of Architecture and Construction, Türkmenistan
- Abdulkadir Tanrıverdi Eskişehir
- Salih Yavuz Yaman Bilkent University
- Semih Zaman Sabancı University
- Alp Eren Köken Bilkent University
Solution: http://www.fen.bilkent.edu.tr/~cvmath/Problem/2207a.pdf