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Q: How much concrete is needed area 20ft long by 12inches wide and 4 inches deep?

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They are the same.

8 inches = 8/12 ft = 2/3 or .66 ft 20ft X 21ft = 420ft2 X .66ft or 2/3ft = 280ft3 (feet cubed )

680

Lots

20ft X 14ft = 280 sq ft /9 = 31.11sq yds X $3.00 = $93.33

Related questions

5 yds - One yard of concrete will cover approximately 81 square feet 4" deep.

That depends on how DEEP you want the concrete !

9.3 cubic yards of cement is required for this slab.

20 feet is 240 inches.

631cm = 20ft 827⁄64in

242/12, ie 20ft 2 in

google it people thats y its there smart ones

106.67 Cubic Yards

20 feet x 20 ft x .3333 ft = 133.33 cubic feet / 27 cubic feet per yard = 4.94 cubic yards

20 times 50 divided by three is 333 1/3

20ft

840 in (12 x 2 x (20 + 15))

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