An aquarium tank is 1/6 full of water. When 2 gallons of water are added, the tank becomes 1/2 full. What is the total capacity of the aquarium tank, in gallons?
C ==Full tank
1/2C - 1/6C ==1/3C
1/3C == 2
C ==2 x 3 ==6 gallons - full capacity of the tank.
