A cube of 3x3x3 is painted from all the 6 faces. If I cut the cube in 27 equal cubes of 1x1x1 then how many cubes will be painted on exactly 2 faces?

One Answer on this Question

1. A 1×1 cube in the middle of an edge of the 3×3 cube will
   have two faces painted. A cube has 12 edges, so the answer
   is 12.

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