Answer is 93.8 liters gas
Step by step
We know 368.5 miles per 50 liters gas
We want to find the rate
Divide 368.5 by 50 = 7.37 miles per 1 liter
Now we want to find how many liters per 691 miles.
We take 691 divided by the rate of 7.37 miles per 1 liter = 93.8 liters gas
Problem solved