Respuesta :

It is known that 1 gallon is 3.78541 litres.

So it follows:

[tex]\begin{gathered} 1\text{ gal= 3.78541 litres} \\ 3.5\text{ gal=3.78541x3.5 litres} \\ 3.5\text{gal}=13.2489litres \end{gathered}[/tex]

Hence the value of 3.5 gallons is 13.2489 litres.