Arectangular prism has a length of 20 in., a width of 2 in., and a height of 3 in.

the prism is filled with cubes that have edge lengths of in.

how many cubes are needed to fill the rectangular prism?

Calculate the volume of both the prism and the cubes:

Prism:

Volume = 20 x 2 x 3.25 = 130 cubic inches.

Volume of cube:

Volume = S^3 = 1/4^3 = 1/64 ( 0.015625)

Divide the area of the prism by the area of the cube:

130 / 1/64 = 130 * 64 = 8,320

It would take 8,320 cubes to fill the prism.

c. (3,2,6) is the answer.