A concrete square column is 3.5 meters long and its cross section is a square with side length of 3 decimeters. Each cubic decimeter of concrete weighs 2.2 kg. How many kg are eight such square columns

3.5 m = 35 decimeters
2.2×（3×3×3.5）×8
=2.2×31.5×8
=554.4kg

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