we can use cross multiplication
[tex]\begin{gathered} 5\text{oranges}\longrightarrow1.7 \\ 1\text{orange}\longrightarrow x \end{gathered}[/tex]where x is the value of one orange
[tex]\begin{gathered} x=\frac{1\times1.7}{5} \\ \\ x=0.34 \end{gathered}[/tex]the value of each orange is $0.34