volume = 3in x 3in x 3in = 27in3
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The volume of a 3-inch cube is 27 cubicinches. (not "inches")
If you double a 2-inch cube to a four-inch cube, its volume increases from eight cubic inches to 64 cubic inches.
Well, darling, a 1-inch cube has a volume of 1 cubic inch. It's as simple as that. So, if you ever need to fill a tiny cube with some liquid courage, you'll know exactly how much it can hold.
The bulk of the question is irrelevant ! If all you need is the surface area of the 3-inch cube, simply multiply 3 x 3 x 6 to give 54 square inches !
343 cubic inches.