In Europe, gasoline efficiency is measured in km/L. If your car's gas mileage is 21.0 mi/gal , how many liters of gasoline would you need to buy to complete a 142-km trip in Europe? Use the following conversions: 1km=0.6214mi and 1gal=3.78L.

Answer 1

21.0 miles/gallon x (1 mile/0.621 km) x (1 gallon/3.78 L) = estimated 9 km/L but you need to redo to get a more accurate answer.
Then 9 km/L x #L = 142 km
Solve for # L.
Post your work if you get stuck.