2(7 x 3) x (4 x 3) = 504 ft. cubed
So approx. 3.94 cords.
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A cord takes up 128 cubic feet and your space is 3456 cu ft, so 3456/128 = 27 cords
1.21x E -7
A cord of wood occupies a volume of 128 cubic feet.[1] Step 1: The volume of the room is:LxWxH = (8 yards)(8 yards)(5 yards) = 320 cubic yards------------------------------------------------------------------------------[2] Step 2: Converting that into feet where 3 feet = 1 yard, you get the following:(3 feet)^3 = (1 yard)^327 cubic feet = 1 cubic yard(320 cubic yards)(27 cubic feet / 1 cubic yard) = 8640 cubic feet.------------------------------------------------------------------------------[3] Step 3: Now you just divide:8640 cubic feet of space / 128 cubic feet of wood = 67.5 cords!!
8 inches = 8/12 ft = 2/3 or .66 ft 20ft X 21ft = 420ft2 X .66ft or 2/3ft = 280ft3 (feet cubed )
That room would be 169 s.f.