How many small cubes are there with no red paint at all?
Explanation:
Cubes with no red paint = Total cubes – cubes with red paint on them.
Total cubes = 125.
Number of cubes with red paint = 25 + 25 – 5 = 45 (25 cubes on both front and back face – 5 common cubes on the edge)
∴ Cubes with no red paint = 125 – 45 = 80.
Hence, 80.
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