1 ft3 = 12 x 12 x 12 = 1728 in3
48 x 48 x 48 = 110592 : expressed as cu ft this is 110592/1728 = 64 cu ft.
Alternative Method : 48 = 4 x 12 : so 483 = 43 x 123 : as 123 is the conversion factor from cubic feet to cubic inches then the answer in cubic feet is 43 = 64.
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1,728 cubic inches = 1 cubic foot
96" x 48" x 18" = 82,944 cubic inches = 48 cubic feet
Another way:
96 inches = 8 ft
48 inches = 4 ft
18 inches = 11/2 ft
8' x 4' x 1.5' = 48 ft3
I get 7.5 cubic feet. The dimensions come to 12,960 cubic inches. There are 1,728 cubic inches in a cubic foot. 12,960 / 1,728 equals 7.5.
This question cannot be answered for cubic feet is a volume measure, and inches is a linear measure.