205 x 135 = 27,675 sq inches.
There are 144 sq inches in 1 sq foot
therefore, 27,675 divided by 144 = 192.1875 sq feet
another way to do it: convert the inches to feet to begin with by dividing them by 12 (since there are 12 inches per foot):
205 in. = 17.0833 ft.
135 in. = 112.5 ft.
17.0833 x 112.5 = 192.1871 sq feet
The difference of .004 is due to rounding of 17.0833, which is actually 17.0833333...
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135 + 75 + 205 + 805 = 1,220
205/12 = 17 feet and 1 inch left over
There are 100 cm in a metre so:205 m = 205 m x 100 = 20,500 cm
17.9 ft x 17.1 ft = 306.1 ft^2
364-205= 159 (the difference between the two numbers)