Two opposite sides of a cube are painted red. On the remaining four sides, two adjacent sides are coloured green and the remaining two are blue. Two cuts are made in each of X, Y and the Z axis. Assume the inner faces of the cubes are white in colour. How many cubes have more than 3 white faces?

Two opposite sides of a cube are painted red. On the remaining four sides, two adjacent sides are coloured green and the remaining two are blue. Two cuts are made in each of X, Y and the Z axis. Assume the inner faces of the cubes are white in colour. How many cubes have more than 3 white faces? Correct Answer 19

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2 cut in each direction means the cube is made to 33 small cubes. Hence there are 27 small cubes out of which the corners have 3 white sides and the edges with 4 white sides and centre cubes with 5 white sides.

Therefore, cubes with >3 white side = 27 – 8 = 19.

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