posted by noman on .
A cube 4 cm on each side is painted blue and cut into 64 one cm cubes. How many one-cm cubes are painted blue on exactly two faces?
The cubes with two sides painted must lie along the edges, except those at the corner, (they would have 3 sides painted
On each side I see 2 blocks that would be painted on 2 sides
so the number of blocks = 6x2 or 12
Hmmm. I get 24, since there are 12 edges.