Question

suppose that you're building a shed and me to pour concrete slab to support it. You know that the slab will be 15 feet wide, 10 feet long, 6 inches deep. concrete is usually sold by the cubic yard. How many cubic yards of concrete will you need for the slab?

Answer 1

convert all to one unit - I'm choosing feet
15 x 10 x 0.5 = 15 x 5 = 75 feet
1 cubic yard = 1 yard x 1 yard x 1 yard = 3 ft x 3 ft x 3 ft = 27 feet?

75/27 = 2.77777778 cubic yards (I think)