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20" = 1.666666667' 1.666666667 X 1.666666667 X 15 = 41.66666667^3 41.66666667^3 X 125lbs = 5,208.333334 lbs I an assuming that the 20 is in inchs and not feet. If the 20 is feet, than it would be 20 X 20 x 15 x 125.

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16y ago
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Q: How much does a 20x20x15' concrete column weigh if concrete used is 125 lbsft3?
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