7*10 = 70 square feet
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21 ft.
20ft x 10ft x 7ft = 1400 cubic feet 1 yard of dirt = 27 cubic feet Hence yards required = 1400/27 = 51.85
It is: 7 times 3 = 21 square feet
multiply them all toether!
In yards, the room is 3 yards by 7/3 yards. By multiplying those numbers together, you see that the area is 7 square yards.