In Europe, gasoline efficiency is measured in km/L. If your car's gas mileage is 31.0mi/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.

To answer the question, convert your mileage from mi/gal to km/L using the conversion factors given.

(31.0 mi/gal) x (1 km / 0.6214 mi) x (1 gal / 3.78 L) = 13.20 km/L

Divide the the distance by the converted mileage.

(142 km) / (13.20 km/L) = 10.79 L

Thus, you need to buy approximately 10.79 liters of gasoline.

We need to convert the mileage from mi/gal units into to km/L units using the conversion factors.

(31.0 mi/gal) x (1 km / 0.6214 mi) x (1 gal / 3.78 L) = 13.20 km/L

Next, we divide the distance by the mileage.

(142 km) / (13.20 km/L) = 10.79 L

Therefore, you need 10.79 liters of gasoline.