A car has a 16-gallon fuel tank. When driven on a
highway, it has a gas mileage of 30 miles per gallon.
The gas mileage (also called "fuel efficiency") tells u
the number of miles the car can travel for a particula
amount of fuel (one gallon of gasoline, in this case).
After filling the gas tank, the driver got on a highway
and drove for a while.
How many miles has the car traveled if it has the
following amounts of gas left in the tank?
Write an equation that makes it easier to find the amount of gas left in the truck, x, if we know the car has traveled d miles