document.write( "Question 210974: A rectangular skating rink measures 40 m by 20 m. Next year the rink is to
\n" ); document.write( "be doubled in area by extending each side by the same amount. Determine how
\n" ); document.write( "much each side should be extended, to the nearest tenth of a meter. \n" ); document.write( "

Algebra.Com's Answer #159387 by Earlsdon(6294) $\"\"$ $\"About$

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The present area is:
\n" ); document.write( " $\"A+=+40%2A20\"$ sq.m.
\n" ); document.write( " $\"A+=+800\"$ sq.m. If you add x to the width and this doubles the area, you have:
\n" ); document.write( " $\"1600+=+40%2820%2Bx%29\"$ Divide both sides by 40.
\n" ); document.write( " $\"40+=+20%2Bx\"$ Subtract 20 from both sides.
\n" ); document.write( " $\"20+=+x\"$
\n" ); document.write( "The sides must be extended by 20 meters. \n" ); document.write( "

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