Answer: Our required equation would be
![d=28g](https://img.qammunity.org/2019/formulas/mathematics/middle-school/5o95smxuu4a1ikoss96u7nfmg3fnwdhm3v.png)
Explanation:
Since we have given that
Number of miles = 140
Number of gallons of gasoline = 5
Let the distance in miles be 'd'.
Let the number of gallons of gas be 'g'.
According to question, we get that
![(140)/(5)=(d)/(g)\\\\28=(d)/(g)\\\\d=28g](https://img.qammunity.org/2019/formulas/mathematics/middle-school/hua5b10ezj8sd0yymgt1a6mq09use4jy9j.png)
Hence, our required equation would be
![d=28g](https://img.qammunity.org/2019/formulas/mathematics/middle-school/5o95smxuu4a1ikoss96u7nfmg3fnwdhm3v.png)