22 gallons
1) In this question, we need to assume that the number of gallons of gas per mile is constant.
2) Thus, we can write out the following proportion:
[tex]\begin{gathered} 1-----7miles \\ g------154 \\ \frac{1}{g}=\frac{7}{154} \\ 7g=154 \\ \frac{7g}{7}=\frac{154}{7} \\ g=22 \end{gathered}[/tex]So, we can state that I will need 22 gallons of gas to make 154 miles.
