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Unit Cubes (Posted on 2004-02-02) Difficulty: 3 of 5
Some unit cubes are assembled to form a larger cube. Some of the faces of the larger cube are then painted. The cube is taken apart and it is found that 217 of the unit cubes have paint on them. What is the total number of unit cubes?

See The Solution Submitted by Brian Smith    
Rating: 3.8333 (6 votes)

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re(2): Extension (A deeper question) | Comment 11 of 15 |
(In reply to re: Extension (A deeper question) by nikki)

Sorry for wording my question so poorly.

I think you interpreted it right, I want numbers that yield multiple solutions.

91 does because there could be a 7x7x7 cube painted on two adjacent sides or a 6x6x6 cube painted on 3 sides that share a vertex.

I'm not sure 23 can be done in any way except a 3x3x3 cube painted on 4 sides not in a ring. I haven't checked the others.

Are there any numbers that do give _more_ than 2 possible solutions? (besides 1 and 8)

-Jer
  Posted by Jer on 2004-02-05 09:42:47

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