A large cube after painting it
on all faces was divided into 125 smaller equal cubes.
How many cubes are painted from 3 sides?
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A cube has six faces.
25% of the smaller cubes faces are only shown on edge cubes.
The eight corner cubes show 50%.
The cubes that are left showing a face are 3 x 3 on each face. = 36
The inner cubes are 3 x 3 x 3. = 27
A total of 63 cubes have less than 25% covered.
There's the data. There's enough there for you to sort it out.
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