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?
Two gallons of water raises the level from 1/6 to 2/6,
which means that 2 gallons accounts for 1/6 of a tank.
So, it would take 12 gallons to account for 6/6 of a tank.
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