There is no equivalence.
A yard is a measure of length or distance in 1-dimensional space while what is given in the question is a measure of volume in 3-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.
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How many square yards in a 20x18 feet 3 inches thick
four
50x100x4 = 20,000 cubic inches36 inches in a yard20,000/36 = 555 5/9 cubic yards.
It depends on what "5 thick" is: 5 inches thick, 5 feet thick, 5 yards thick, 5 miles thick etc.
1.62