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Question 18
The six faces of a wooden cube of side 6 cm are labelled A, B, C, D, E and F respectively. Three of these faces A, B, and C are each adjacent to the other two, and are painted red. The other three faces are not painted. Then, the wooden cube is neatly cut into 216 little cubes of equal size. How many of the little cubes have no sides painted?
Solution
Since A, B and C are adjacent faces. If we remove them, the resultant solid will also be a cube with side 5.
Hence total number of cubes unpainted = $$5^3$$ = 125
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