Answer:
91 miles
Explanation:
Let's make a proportion
miles/gallons=miles/gallons
The vehicle gets 39 miles on 1.5 gallons, and x miles on 3.5 gallons
39 miles/1.5 gallon= x miles/3.5 gallons
39/1.5=x/3.5
Now, we need to solve for x. To do this, we have to get x by itself. x is being divided by 3.5 To undo this, multiply both sides by 3.5, because multiplication is the opposite of division.
3.5*39/1.5=x/3.5*3.5
The 3.5s on the right cancel, so we are left with:
3.5*39/1.5=x
3.5*26=x
91=x
The vehicle gets 91 miles on 3.5 gallons of fuel