Question 882284

A 60-ft. by 80-ft. parking lot is torn up to install a sidewalk of uniform width around its perimeter. The new area of the parking lot is two-thirds of the old area. How wide is the sidewalk? 
<pre>
Quadratic equation formed: {{{W^2 - 70W + 800 = 0}}}
W, or width of sidewalk:   {{{highlight_green(highlight_green(14.3845))}}}      OR	   55.6155 (ignore)
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