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2014-11-17T22:59:30+08:00

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L=3w

(l-20)(w+10)=A+200
(3w-20)(w+10)=A+200
3w^{2}+30w-20w-200=A+200
3w^{2}+10w-200=A+200
3w^{2}+10w-400=3w^{2}
10w-400=0
10w=400
w=40

l=3w
l=3(40)
l=120

Therefore the length is 120 and the width is 40
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