Lamonte's car used 5 gallons to travel 125 miles. How many gallons of gas would he need to travel 400 miles?

First, let's determine the number of miles Lamonte's car can travel on one gallon of gas:

125 miles / 5 gallons = 25 miles per gallon

Now that we know the car's fuel efficiency, we can calculate the amount of gas needed to travel 400 miles:

400 miles / 25 miles per gallon = 16 gallons

Therefore, Lamonte would need 16 gallons of gas to travel 400 miles.