Answer:
With 1 gallon of blueberries, Sam can fill 4/3 of his container.
Explanation:
By the given situation:
1/2 gallon of blueberries ⇒ The container is 2/3 full
Now, let us assume 1 gallon of blue berries ⇒ The container is m full.
Now, by the RATIO OF PROPORTIONALITY:

Hence, with 1 gallon of blueberries, Sam can fill 4/3 of his container.