[tex]\it Vom\ nota:\\ \\ m\ -\ por\c{\it t}iunea\ cur\breve a\c{\it t}at\breve a\ de\ Matei\ ;\\ \\ r\ -\ por\c{\it t}iunea\ cur\breve a\c{\it t}at\breve a\ de\ Radu\ .\\ \\ m+r=15 \Rightarrow m=15-r\ \ \ \ \ \ \ (1)\\ \\ m > r\ cu\ 3 \Rightarrow m=r+3 \ \ \ \ \ \ \ \ \ (2) \\ \\ (1),\ (2) \Rightarrow r+3=15-r \Rightarrow r+r=15-3 \Rightarrow 2r=12 \Rightarrow r=6\ \ \ \ (3)\\ \\ (2),\ (3) \Rightarrow m=6+3 \Rightarrow m=9\ metri[/tex]
