Since the ratio of ounces of gas to oil is 32 to 1, we can solve the question by the rule of three.
[tex]\begin{gathered} 32\rightarrow1 \\ 96\rightarrow x \end{gathered}[/tex]Then
[tex]\begin{gathered} x=\frac{96\cdot1}{32} \\ =\frac{96}{32} \\ =3 \end{gathered}[/tex]Therefor, the lawn mower needs 3 ounces of oil.