ok
you can use cross multiplication
one pints is equal to 0.47L
[tex]\begin{gathered} 1pt\longrightarrow0.47l \\ 7pt\longrightarrow x \end{gathered}[/tex]where x is the liters on 7pt
[tex]\begin{gathered} x=\frac{7pt\times0.47l}{1pt} \\ x=3.29 \end{gathered}[/tex]the proportion is 0.47L per pints