1.

A cube is painted blue on all faces. It is cut into 125 smaller cubes of equal size. How many cubes are not painted on any face?

Answer»

8
16
18
27

Solution :The number of small cubes = 125 = `5^(3)`.
TAKE X = 5 and x = 1.
Such cubes are `(X/x-2)^(3)=(5-2)^(3)=27`.


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