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18 feet = 9 yards

12 feet = 4 yards

9 yards X 4 yards = 36 square yards

A cubic yard is 36" x 36 " x 36 "

36 " / 4" = 9 (4" sections)

Thus, 1 cubic yard has 9 square yard layers which are 4" thick

So, 1 cubic yard will cover 9 square yards 4" thick

So, 4 cubic yards will cover 36 square yards which are each 4" thick

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15y ago

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