Answer:
7.9 ounces
Step-by-step explanation:
Hello, great question. These types are questions are the beginning steps for learning more advanced Equations.
For this problem we can use a simple Rule of Three property to solve this problem.
[tex]\frac{3.5 oz}{17.5 gl}[/tex] = [tex]\frac{x}{39.5 gl}[/tex]
Now we cross multiply 3.5 by 39.5 and then divide the answer by 17.5 to get x like so,
[tex]\frac{3.5oz*39.5gl}{17.5gl} = x[/tex]
[tex]7.9oz = x[/tex]
Finally, we can see that 7.9 ounces should be added to the 39.5 gallons of gasoline.
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.