Metric countries rate the fuel efficiency of a car by the number of liters of gasoline required to drive 100 kilometers. If a car takes 12 liters per 100 kilometers, what is its efficiency in miles per gallon? Use the conversions 1gal=3.7854 L and 1 mile=1.6 km.
Answer:
in 12 liter the car goes 100 km
3.7854 L = 1 gal
1 L = 1/ 3.7854 gal
12 L= 1/3.7854 x 12 = 3.1700 Gal
second step
1.6 km = 1 mile
1 km = 1/1.6 mile =O.625 mile
so
using 3.1700 gal of gasoline the car goes 0.625 miles
therefore using 1 gal of gasoline the car will go 0.625/3.1700 = 0.197 miles
so the efficiency in mile/ gal is –––> 0.197 miles per gal ..
if you round it off the answer is 2