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?

Answer 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