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There are 9 CU FT in a yard....and if this is stated in feet, then take your measurement of 12x21 feet or 252 square feet times (7 inches/12 inches or .5833333 feet) to give you 147 Cubic feet , then divide by 9 CUFT/YD or 16.3333 Cu Yards....about two standard mixer loads

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14y ago
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Q: How many yards do you need for a 12x21 and 7 inches deep?
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