The gas in his car is 16 gallons and he used 7/8 of the gas to get home. The cost of the gas per gallon is $3.25. The cost of the gas he used to get home can be calculated below.
[tex]\begin{gathered} \frac{7}{8}\times16=14gallons \\ \end{gathered}[/tex]He used 14 gallons of gas to get home . The cost of the gas used can be calculated below
[tex]\begin{gathered} 1\text{gallons }=\text{ \$3.25} \\ 14\text{gallons}=\text{?} \\ \text{cross multiply} \\ \text{cost}=14\times3.25 \\ \text{cost}=45.5\text{dollars} \end{gathered}[/tex]cost of gas needed to get home = $45.5