79 - 7 = 72 = 6 x 12
assuming question is
What is 6 feet 7 inches in inches
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(15-9) ft + (7-5) in = 6 ft 2 in
7 ft 6 in x 11 ft 6 in = 7.5 ft x 11.5 ft = 86.25 sq feet.
Volume of sand required = 7 ft * 7 ft * 1/6 ft = 49/6 cubic feet = 8.166... cubic ft.
(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
1 yard = 3 feet. So 9 yd 7 ft - 6 yd 8 ft = 2 yd 2ft