First I find cubic feet.
30x48 divided by 3 for 4 inches thick. 480 cubic feet
27 cubic feet make a cubic yard.
480 divided by 27=17.8
I'd order 18 yards but also tell the ready mix company what I was doing so I wouldn't waste money.
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You need to specify the slab's width and the length as well.
20 i think
Yes or in yards
9 yards x 27 yards = 243 square yards.
15 x 10 = 150 square yards