[tex] \frac{x}{y}= \frac{1}{5} =\ \textgreater \ x=\frac{y}{5}[/tex]
[tex] \frac{z}{y}= \frac{2}{3} =\ \textgreater \ z=\frac{2y}{3}[/tex]
[tex] \frac{z+y}{x}= \frac{ \frac{2y}{3} +y}{ \frac{y}{5}}=\frac{ \frac{2y+3y}{3}}{ \frac{y}{5}}= \frac{5y*5}{3*y}[/tex]
[tex]=\frac{5y*5}{3*y}=\frac{25}{3}[/tex]
