(15−2x) represents the width of the pool without the walkway
The area is given as:
Area = 300
From the question, we have:
Width = Length - 5
And the area of the pool without the walkway is:
A = (20 - 2x)(15 - 2x)
Since the width is 5 feet shorter than the length, then
(15−2x) would represent the width of the pool while (20−2x) would represent the length of the pool.
Hence, (15−2x) represents the width of the pool without the walkway
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