ten and a half
6 x 7 x 0.25 = 10.5
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You can convert between feet and inches, or between cubic feet and cubic inches. You can not convert between cubic feet and inches.
12 in = 1 ft → 40 in × 48 in × 60 in = (40 ÷ 12) ft × (48 × 12) ft × (60 × 12) ft = 10/3 ft × 4 ft × 5 ft = 200/3 cu ft = 66 2/3 cu ft ≈ 66.67 cu ft
Eight cubic feet - assuming you meant 24 inches on each side.
1 foot = 12 inches 20 ft * 7 ft can be expressed as 240 inches * 84 inches, then 240 in * 84 in * 2 in = 40320 inches cubed or 3360 cubic feet
Convert the inches to feet and work out the volume of the cuboid with base area 110 sq ft and height of 3 inches: 12 in = 1 ft → volume = 110 sq ft x 3 in = 110 sq ft x 3/12 ft = 27 ½ cu ft (= 27.5 cu ft)