How many cubes have 1 blue face?
Geometry
Level
2
A wood of block measuring 5 in. by 6 in. by 7 in. is painted blue. It is then completely cut to cubes which measure 1 in. on an edge. How many cubes have 1 blue face?
210
94
48
118
96
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Only the cubes on the surface at least one cube from the edge has 1 blue face. Therefore, there are
2
(
4
×
3
+
3
×
5
+
4
×
5
)
=
9
4
cubes.
