Question

you have 20 cubes (2 in x 2 in x 2 in) that you need to collect in boxes and ship to your friend. The dimension of your boxes are 4 in x 5 in x 4 in. How many of these boxes will you need to ship all cubes

Answer 1

Since one of the dimensions of the box is not a multiple of 2, you can
only fit 8 of the cubes in a box,

so 2 boxes will hold 16, so you need a third box
answer: 3 boxes

btw, all of the 3 boxes will only be partially filled.