Answer:
160 plastic cubes
Explanation:
first find the volume the box can hold so,
4 x 2.5 x 2 = 20ft^3
from their find the volume of each plastic cube so,
.5 x .5 x .5 = .125ft^3
then you can divide the volume of the box by the volume of the plastic cube to see how many will fit
20 รท 0.125 = 160 plastic cubes