# Math

How many cubic yards of concrete are needed to make 1200 square concrete posts 9-inches by 9-inches by 6-feet?

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1. (3/4)(3/4)(6) = 3.375 ft^3/post

3.375 ft^3/post * 1200 posts = 4050 ft^3

but 27 ft^3 = 1 yd^3

4050 ft^3 * 1 yd^3/27ft^3 = 150

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