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It was a bright, sunny, and hot day when I decided to mix up the tweleve (12) bags of ready mix concrete needed to fill up the 21" square by 24" deep hole that the pier set in. I erected my pop up canopy to provide shade and went to work. I calculated that I would need ten (10) bags, so I bought twelve (12) just in case. Either my math was off or the bags contained less than the advertised volume of concrete, as I had just enough concrete using every bag I had.