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There are 3 feet in 1 yard

There are 12inches in 1 foot

There are therefore 36 inches in a yard, 1296 square inches in 1 square yard and 46656 cubic inches in 1 cubic yard.

A 150 sq ft slab therefore is equivalent to a 21560 square inch slab, if this slab is 4 inches deep then it comprises 86400 cubic inches of concrete.

Thus the number of cubic Yards of concrete you require is 86400/46656 = 1.85

i.e. (almost 2).

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Q: How many cubic yard of concrete you need for 150 sq-ft slab withd 4 inches thick?
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