A uniform width boardwalk is built around the inside edge of a rectangular parkland that is 30 m by 5 m. If the boardwalk takes up 20% of the lot, how wide is the boardwalk to the nearest cm?

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  1. If the walk has width w, then since the parkland occupies 80% of the area,

    (30-2w)(5-2w) = 0.80*30*5
    w = 0.4396m

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