Answer:
 gallons
Explanation:
The full capacity of the fuel tank is W gallons. 
In the beginning, the tank was 
 part full. 
That means initially there was 
 gallons of fuel. 
Now, after reaching the destination the car has consumed 60% of the fuel in the tank. 
So, the volume of remaining fuel is (100 - 60) = 40% of initial volume i.e 
 gallons. (Answer)