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Mathematics
OpenStudy (anonymous):

a rectangular building that measures 100m by 80m is to be surrounded by a lawn of uniform width. The area of the lawn must equal the area of the building. Find the width of the lawn, to the nearest tenth of a metre

OpenStudy (anonymous):

I got up to \[w ^{2}+90w-2000\]

OpenStudy (anonymous):

Looks good to me. well done!

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