Final answer:
To find the fraction of the 3-gallon container that is full, divide 1/3 gallon by the total capacity of the container to get 1/9. Therefore, the container is 1/9 full.
Step-by-step explanation:
The question is asking how much of a 3-gallon container is full when it contains 1/3 gallon of water.
To answer this, we divide the amount of water in the container by the total capacity of the container.
This gives us ½¼1/3 gallon ÷ 3 gallons = 1/9.
Therefore, the container is 1/9 full.