This mulch will be of cylindrical shape. The volume (V) of a cylinder is: V = l · w · h (l - length, w - width, h - height (in our example, height = depth)
It is known: l = 125 feet w = 60 feet h = 6 inches = 0.5 feet
V = l · w · h = 125 · 60 · 0.5 = 3750 feet³
Since 1 cubic foot is 0.037 cubic yards, 3750 cubic feet are 139 cubic yards: 0.037 · 3750 feet³ = 138.75 cubic yards ≈ 139 cubic yards
This is a round robin style tournament. Given that there are 25 people, and order doesn't matter meaning that the combination AB is equivalent to BA you must use the choose formula.
Thus the answer should be 25C2 or <em>25! / [(25-2)! * 2!] = 300</em>
