document.write( "Question 262852: im having a hard time with this problem,please help! if the length of a rectangular parking lot is 20 meters less than twice its width,and the perimeter is 800 meters,find the length of the parking lot. \n" ); document.write( "

Algebra.Com's Answer #193624 by dabanfield(803) $\"\"$ $\"About$

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im having a hard time with this problem,please help! if the length of a rectangular parking lot is 20 meters less than twice its width,and the perimeter is 800 meters,find the length of the parking lot.\r
\n" ); document.write( "\n" ); document.write( "Let w be the width and l the length of the parking lot. Then we have:\r
\n" ); document.write( "\n" ); document.write( "1.) Perimeter = 2*w + 2*l = 800
\n" ); document.write( "2.) l = 2w - 20 \r
\n" ); document.write( "\n" ); document.write( "Let's rewrite these two equations:\r
\n" ); document.write( "\n" ); document.write( "1.) 2w + 2l = 800
\n" ); document.write( "2.) 2w - l = 20\r
\n" ); document.write( "\n" ); document.write( "Subtracting equation 2.) from equation 1.) we have:\r
\n" ); document.write( "\n" ); document.write( "3*l = 780
\n" ); document.write( "l = 780/3 = 260\r
\n" ); document.write( "\n" ); document.write( "Calculate w from 2.:\r
\n" ); document.write( "\n" ); document.write( "2*w - 260 = 20
\n" ); document.write( "2w = 280
\n" ); document.write( "w = 140 \n" ); document.write( "

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