You need to cover the playground of a child development center with mulch. the playground is 125 feet long and 60 feet wide. you want the mulch to be at least 6 inches deep. how many cubic yards of mulch should you have delivered? round your answer to the nearest whole number.

The answer is 139 cubic yards

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

The answer should be 3%

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