Question

You are on a 650-mile trip. your car used eight gallons of gas to travel the first 210 miles of the trip. how much more gas will you need to make it the rest of the way at the same rate?

Answer 1

8 gallons per 210 miles = 210/8 = 26.25 miles per gallon

650 - 210 = 440 miles left to travel
440/26.25 = 16.76 gallons

or
8/210 = x/440
cross multiply
210x = 3520
x = 3520/210
x = 16.76 gallons