[tex]\it Fie\ x,\ y\ numerele\ cerute.\\ \\ \left.\begin{aligned} \it x:y=20:4 \Rightarrow x:y=5 \Rightarrow x=5y\\ \\ \it x-y=36 \Rightarrow x=y+36 \end{aligned}\right\} \Rightarrow 5y=y+36|_{-y} \Rightarrow 4y=36|_{:4} \Rightarrow\\ \\ \\ \Rightarrow y=9\\ \\ x=5\cdot9=45[/tex]
[tex]\it y\ \ |\rule{30}{0.7}|\\ \\ x\ \ |\rule{30}{0.7}|\rule{30}{0.7}|\rule{30}{0.7}|\rule{30}{0.7}|\rule{30}{0.7}|\\ \\ x\ \ |\rule{30}{0.7}|\ - \ - \ -\ \ (+\ 36)\ -\ -\ - \ \ \ |\\ \\ 4y=36 \Rightarrow y=9[/tex]
