Answer:
It takes 135 of the 1/3 unit cubes to fill the prism.
Explanation:
The volume of the prism is 5 cubic units. This means the prism can be filled with five 1×1×1 unit cubes
How many cubes with 1/3 unit side lengths can fit in a cube with 1-unit side lengths?
There are 27 cubes with 1/3 unit side lengths in 1 cubic unit.
Since the rectangular prism is made up of 5 cubic units, we would have 5×27 total cubes with 1/3 unit side lengths.
It takes 135 of the 1/3 unit cubes to fill the prism.