A solid cube of edge 12 cm is cut into small cubes of edge 3 cm. How many times the original total surface area is the combined surface area of the small cubes?
Correct answer A. 4 times
Explanation
Number of small cubes = (12/3)³ = 64. Their total area = 64 x 6 x 9 = 3456 sq cm, against 6 x 144 = 864 sq cm. Ratio = 3456 / 864 = 4.
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