THE CORRECT ANSWER IS (E). EACH OF THE FOUR OUTER SURFACES OF THE...
36. The correct answer is (E). Each of the four outer surfaces of the cube is 9 square
inches with the other two being 8 (subtract one for the hole), and so the cube contains a
total of 52 square inches of outer surface area. Each of the four inner surfaces (inside
the hole) accounts for an additional 3 square inches—for a total of 12 square inches of
inner surface area. The solid’s total surface area
5
52
1
12
5
64 square inches.