66.666 square yards
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All you need to do is multiply the length by the width, and it doesn't matter in what order you do it. 20ft X30ft= 600 square feet.
15ft x 20ft= 5yards x 20/3yards 100/3 sq yards =33.3333333333 sq yards
20ft x 10ft x 7ft = 1400 cubic feet 1 yard of dirt = 27 cubic feet Hence yards required = 1400/27 = 51.85
20ft equals 609.6cm (30.48cm per ft).
20 * 18 / 9 = 40 square yards (the divided by nine is because there are exactly nine square feet in one square yard)