They add to 18 feet
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15 ft and 6 inches because there are 12 inches in a foot!
1 ft = 12 in → 5 ft 4 in - 1 ft 6 in = (4 + 1) ft 4 in - 1 ft 6 in = 4 ft (12 + 4) in - 1 ft 6 in = 4ft 16 in - 1 ft 6 in = 3 ft 10 in Alternatively, convert to inches, subtract and convert back: 1 ft = 12 in → 5 ft 4 in - 1 ft 6 in = (5 x 12 + 4) in - (1 x 12 + 6) in = 64 in - 18 in = 46 in = (3 x 12 + 10) in = 3 ft 10 in
I come to believe its 9'4
There 12 inches in 1 foot. Hence in 6 feet there are 6 x 12 = 72 inches.
First, let's convert all dimensions to inches: 3 ft = 36 inches; 2/3 ft = 8 inches; 6 inches = 6 inches. Next, add all dimensions: 36 + 8 + 6 = 50. Then divide by number of inches per foot (12): 50 ÷ 12 = 4 ft, 2 in.