A rectangular pool of 20 m wide and 60 m long is surrounded by a walkway of uniform width. If the total area of the walkway is 516 $$m^2$$ , how wide, in metres, is the walkway?
If the width of the walkway is x, then its area = (60+2x)(20+2x) - 1200 = 516
Solving this, we get x = 3m
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