An aquarium tank is 1/6 full of water. When 2 gallons of water are added, the tank becomes 1/3 full. What is the total capacity of the aquarium tank, in gallons?
Let the capacity of the aquarium tank ==T
1/3T - 1/6T =2
1/6T = 2
T =2 / (1/6) =2 x 6 =12 gallons - capacity of the aquarium tank.
