For a 4-inch thick slab, you will need at least 9.48 Cubic Yards.
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30' x 20' (600 square feet) = 66.6 square yards.
Square yards x 9 = square feet.
There are 3 feet to a yard, and 9 square feet to a square yard. Multiply yards by 3 to get feet. Multiply square yards by 9 to get square feet.
152 square yards = 1,368 square feet.
180 square yards = 1,620 square feet.