I think you mean "How much area will 4 yards of concrete cover?". It depends on the slab thickness and whether or not anything significant is embedded (a lot of rebar, conduit, etc.). If working in feet, measure the width length and depth, multiply these numbers then divide the result by 27 to calculate the volume in cubic yards. A slab 9' 6" by 10' 4" by 6" thick translates to 9.5x10.3x.5 (48.93) /27 = 1.8 yards. Since you already have the volume, you will need to play with some of the dimensions to find something that works.
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39.1116 cubic yards
50/3 cubic yds of concrete
One square yard is nine square feet, so 27 square feet is equivalent to 3 square yards. So 3 yards of concrete will cover 27 square feet.
20 feet x 20 ft x .3333 ft = 133.33 cubic feet / 27 cubic feet per yard = 4.94 cubic yards
3.16 Cubic Yards