12 inches = 1 ft so 840 in = 840/12 ft = 70 ft. Simple!
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There are far too many alternatives. For example, 1 ft * 1 ft * 4.4 ft or 1 ft * 2 ft * 2.2 ft or 1 ft * 4 ft * 1.1 ft or 10 ft * 0.1 ft * 4.4 ft or 10000 ft * 0.0001 ft * 4.4 ft etc
4 ft * 1.5 ft * 2 ft = 12 cu ft = 89.8 US gallons (approx)4 ft * 1.5 ft * 2 ft = 12 cu ft = 89.8 US gallons (approx)4 ft * 1.5 ft * 2 ft = 12 cu ft = 89.8 US gallons (approx)4 ft * 1.5 ft * 2 ft = 12 cu ft = 89.8 US gallons (approx)
160 ft * 180 ft = 28800 sq ft = 66.1% of an acre.160 ft * 180 ft = 28800 sq ft = 66.1% of an acre.160 ft * 180 ft = 28800 sq ft = 66.1% of an acre.160 ft * 180 ft = 28800 sq ft = 66.1% of an acre.
12 ft * 10 ft * 10/12 ft = 10 cubic feet.12 ft * 10 ft * 10/12 ft = 10 cubic feet.12 ft * 10 ft * 10/12 ft = 10 cubic feet.12 ft * 10 ft * 10/12 ft = 10 cubic feet.
There are an infiite number ofanswers. Some of them are: L = 216 ft x W = 1 ft 108 ft x 2 ft, 20ft x 10.8 ft 72 ft x 3 ft, 30 ft x 7.2 ft 54 ft x 4 ft, 40 ft x 5.4 ft etc