How many small cubes are there with one face painted red?
Explanation:
If we look at the front surface in the diagram, there are 20 cubes with red on only one face.
(Edge cubes are excluded).
Similarly, there are 20 cubes on the right surface with red on only one face.
∴ Number of cubes with one face painted red = 20 + 20 = 40.
Hence, 40
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