The expression to calculate the number of staples used to secure fabric every n feet is provided using a formula and an example.
To find the number of staples used to secure 20 feet of fabric with a staple every n feet:
Formula: Number of staples = (20 / n)
Example: If a staple is placed every 5 feet, the number of staples used would be (20 / 5) = 4 staples.
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