Calculate the number of cubic yards of concrete needed for the cellar floor in a 30 ft x 40 ft house using accurate methods The slab is 3 in thick Show all work?

1 cubic yard = 27 cubic ft

3 inches = 0.25 foot

The volume of the slab is (30 x 40 x 0.25) = 300 cubic ft

= (300 / 27) = [ 11 and 1/9th ] cubic yards = 11.111 (rounded, repeating)