The first picture is the information, and the the second is the actual question.

Question

The first picture is the information, and the the second is the actual question. Please explain to me how you get your answer. I am very confused. Thank you in advance :)
A certain blend of gasoline (a fuel that is a hydrocarbon) requires 14 parts of air to one part gasoline for optimal combustion (14:1 mass:mass ratio). Gasoline weighs about 2.6 kg/gallon (assuming it is nearly all octane) The automobile that is burning this fuel at that l4:1 ratio runs for 50 miles on one gallon of gasoline. Assume complete, clean combustion of this gasoline with oxygen.

Explanation / Answer

50 miles requires 1 gallon of fuel

Therefore 125 miles require = 125 miles X 1 gallon / 50 miles = 2.5 gallons

weight of gasoline = 2.6 kg/gallon X 2.5 gallons = 6.5 Kg

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