Correct Solutions by,
- Toshihiro Shimizu Kawasaki, Japan
- Magnus Jakobsson Lund, Sweden
- Jepbar Asgarov Hitrowka, Turkmenistan
- Muhammed İkbal Ulvi Boğaziçi University
- Albert Stadler Herrliberg, Switzerland
- Alp Eren Köken Yusuf Ziya Öner Fen Lisesi, Antalya
- Kadyr Annabayev Turkmen State Institute of Architecture and Construction, Ashkabat
- Chui Tsz Fung Hong Kong
- Mehran Hosseini-Pishrobat Bilkent University
- Mümtaz Ulaş Keskin Antalya
- Mountassir Farid Awalee Consulting Paris, France
Solution: http://www.fen.bilkent.edu.tr/~cvmath/Problem/2105a.pdf