Correct Solutions by,
- Toshihiro Shimizu Kawasaki, Japan
- Ahmet Yüksel Aydın
- Leyla Cafarova Azerbaijan
- Magnus Jakobsson Lund, Sweden
- Roger Bengtsson Lund, Sweden
- Gurt Devletov The State Energy Institute, Mary, Turkmenistan
- Lujain Qazmanny Jordan
Solution: http://www.fen.bilkent.edu.tr/~cvmath/Problem/2112a.pdf