The area of a rectangular garden is 30 square meters. The width is 3 meters longer than one-third of the length. Find the length and width of the garden.
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If the length is L then the width=L/3+3.

Area=30=L(L/3+3)=L²/3+3L

90=L²+9L, 90=L²+9L, L²+9L-90=0=(L-6)(L+15), so L=6m.

Width=5m, Length=6m.
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