A cubical tank is filled with water to a level of 2 feet. If the water in the tank occupies 18 cubic feet, to what fraction of its capacity is the tank filled with water?
a) 1/9
b) 2/9
c) 1/3
d) 1/2
e) 2/3
a) 1/9
b) 2/9
c) 1/3
d) 1/2
e) 2/3