The 9 foot ceiling is simply one more foot in height above the previously stated 8 foot ceiling. One could assume that a man who is 8'7" could only comfortably live under a 9 foot ceiling.
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Area of paver = 4 in * 8 in = 4/12 ft * 8/12 ft = 32/144 = 2/9 sq ft Area to be paved = 9 ft * 12 ft = 108 sq ft Number of pavers = Area to be paved/Size of each paver = 108/(2/9) = 486
(6 ft 10 in) + (8 ft 9 in) = (6 + 8) ft + (10 + 9) in = 14 ft 19 in But 19 in = 1 ft 7 in, so (14 ft 19 in) = 15 ft 7 in
The sum of 6 ft 10 inches and 8 ft 9 inches is 15.5833333 feet or 15 feet 7 inches.