You can express the edge lengths in terms of "cubes" or you divide the total volume by the volume of a cube. It works either way.
Edge lengths are .. 80 cubes by 8 cutes by 13 cubes so total volume is .. (80 * 8 * 13) = 8320 cubes
In cubic inches, the volume is .. (20 in)*(2 in)*(3 1/4 in) = 130 in^3. The volume of a 1/4-in cube is (1/4 in)^3 = 1/64 in^3. Then the number of cubes that will fit in the prism is .. (130 in^3)/(1/64 in^3) = 8320 . . . . cubes
8320 cubes are needed to fill the rectangular prism.
