document.write( "Question 830863: the length of a rectangle is three times its width, find the width if its perimeter is 100ft \n" ); document.write( "

Algebra.Com's Answer #500996 by josmiceli(19441) $\"\"$ $\"About$

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Given: $\"+L+=+3W+\"$
\n" ); document.write( "Perimeter = $\"+2W+%2B+2L+\"$
\n" ); document.write( "By substitution:
\n" ); document.write( "Perimeter = $\"+2W+%2B+2%2A3W+\"$
\n" ); document.write( "Perimeter = $\"+8W+\"$
\n" ); document.write( " $\"+100+=+8W+\"$
\n" ); document.write( " $\"+W+=+12.5+\"$
\n" ); document.write( "and
\n" ); document.write( " $\"+L+=+3W+\"$
\n" ); document.write( " $\"+L+=+3%2A12.5+\"$
\n" ); document.write( " $\"+L+=+37.5+\"$
\n" ); document.write( "-------------
\n" ); document.write( "The width is 12.5 ft
\n" ); document.write( "check:
\n" ); document.write( " $\"+100+=+2%2A12.5+%2B+2%2A37.5+\"$
\n" ); document.write( " $\"+100+=+25+%2B+75+\"$
\n" ); document.write( " $\"+100+=+100+\"$
\n" ); document.write( "OK \n" ); document.write( "

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