The number of bags of mulch that is needed to cover the playground is 3,605 bags.
<h3>How many bags of mulch is needed?</h3>
The first step is to determine the volume of the surface of the city playground. The volume is the product of the length, width and height of the playground.
Volume = length x width x height
4 x 40.5 x 66.75 = 10,813.50 inches³
The second step is to determine the number of bags of mulch that is needed to cover the surface of the playground.
Number of bags of mulch = volume of the playground / volume one bag can cover
10,813.50 inches³ / 3 = 3,604.5 bags ≈ 3,605 bags
To learn more about the volume of a cuboid, please check: brainly.com/question/26406747
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