Did you solve it? Cheese cube nibbles

The solutions to today's problems - with cheesy pics!

Earlier today I set you the following four puzzles:

1. You have a cube of cheese that measures 3 x 3 x 3 inches, and you want to slice it into 27 smaller 1 x 1 x 1 inch cubes, as shown below. If you have a straight knife, what's the minimum number of slices you need to do it? You are allowed to rearrange the pieces after each slice.