A larger cube has 27 cubic inch as a volume and in the cub

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A larger cube has 27 cubic inch as a volume and in the cube there are 27 smaller cubes such that their volume is 1 cubic inch. What is the difference between the surface areas' sum of the 27 smaller cubes and the surface area of the larger cube, in square inch?
A. 54
B. 64
C. 81
D. 108
E. 120

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by Max@Math Revolution » Fri Jun 17, 2016 11:16 pm
If we calculate 6*27-6*9=108, D becomes our answer.