24 cubes, each 8 cubic inches, meaning each 2 inches on a side. So the dimensions must be even to fit cubes exactly. Our box with 9 inches is really only effectively 8 inches because that extra inch doesn't help us fit another cube.
So our total volume:
![24 * 8 = (8)(4)h](https://img.qammunity.org/2019/formulas/mathematics/middle-school/pbqb5s56nfqexn1rrucw4mohefehvg3qcj.png)
![h=6](https://img.qammunity.org/2019/formulas/mathematics/middle-school/j8qzhtkxm9w01vbscmi82s9cio3ftujiyb.png)
inches minimum