[MATH QUESTION] What is this I don't even....

theimpatientone
Sun, 12 Dec 2010 16:39:24 +0000

tCB Online course, practice test 1.

A large solid cube is assembled by gluing together identical unpainted small cubic
blocks. All six faces of the large cube are then painted red. If exactly 27 of the small
cubic blocks that make up the large cube have no red paint on them, how many small
cubic blocks make up the large cube?

Answer is 125. Can anyone give me a method for this?