first, find the area of prism ll by multiplying 5/2, 9/4, and 2
this will result in 45/4, or 11.25
now, you have to figure out how many small cubes will fit inside prism ll
we know that the side lengths of the small cubes are 1/4, and since cubes have equal side lengths, you can multiply 1/4, 1/4, and 1/4 to find the area
this will result in 1/64
divide the area of prism ll, 11.25, by the area of the small cubes, 1/64, to get 720
then, do the same thing for prism l
multiply 7/4, 3/2, and 5/4 to get 105/32
divide this by the previous 1/64 to get 210
lastly, to determine how many more small cubes can fit into prism ll, subtract 210 from 720
720-210=510
final answer: 510 cubes
hope this helped!!