Question

Sadie has a cousin Nanette in Germany. Both families recently bought new cars and the two girls are comparing how fuel efficient the two cars are. Sadie tells Nanette that her family’s car is getting 42 miles per gallon. Nanette has no idea how that compares to her family’s car because in Germany mileage is measured differently. She tells Sadie that her family’s car uses 6 liters per 100 km. Which car is more fuel efficient? Please explain everything

Answer 1

Sadie’s family’s car is slightly more fuel efficient than Nanette’s family’s car.

Answer 2

Sadie's car is more fuel efficient.

Explanation:

Consider the provided information.

For comparison both quantity should be same. So convert miles per gallon into kilometers per liter.

Sadie tells her family's car is getting 42 miles per gallon.

To convert miles per gallon into liters per km use the formula:

1 miles per gallon = 0.425144 kilometers per liter

Multiply both the sides by 42.

1×42 miles per gallon = 0.425144×42 kilometers per liter

42 miles per gallon = 17.856 kilometers per liter

That means Sadie's car millage is 17.856 kilometer per liter.

Nanette tells Sadie that her family’s car uses 6 liters per 100 km.

6 Liters = 100 km

Divide both sides by 6.

1 Liters = 16.66..

That means Nanette's car millage is approximately 16.67 kilometer per liter.

Hence, Sadie's car is more fuel efficient.