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Convert the feet to inches, then add the additional inches. 3 * 12 in/ft = 36 in + 6 in = 42 in
Divide by '12' 27/12 = 2 ft 3 inches or 2.25 ft.
You'll have to convert it to cubic inches. A cubic foot has 1 ft length, 1 ft width and 1 ft height. There are 12 inches in a foot so... 12 in x 12 in x 12 in = 1728 in^3 or 1728 cubic inches.
3 ft = 2 ft 12 inches = 12 inches + 12 inches + 12 inches = 36 inches
To convert from inches to feet, divide by 12.