document.write( "Question 277221: A rectangular platform for a concert has a perimeter of 640 feet. Suppose that the length of the platform is three times the width. What are the dimensions of the platform? Thank You \n" ); document.write( "

Algebra.Com's Answer #201872 by JBarnum(2146) $\"\"$ $\"About$

You can put this solution on YOUR website!
P=perimeter
\n" ); document.write( "L=length
\n" ); document.write( "W=width
\n" ); document.write( "GIVEN: P=640 L=3W P=2L+2W
\n" ); document.write( "USE SUBSTITUTION
\n" ); document.write( " $\"P=2L%2B2W\"$ solve for W
\n" ); document.write( " $\"640=2%283W%29%2B2W\"$ distribute
\n" ); document.write( " $\"640=%286W%29%2B2W\"$ add
\n" ); document.write( " $\"640=8W\"$ divide
\n" ); document.write( " $\"highlight%2880=W%29\"$
\n" ); document.write( "___
\n" ); document.write( "if W=80 then:
\n" ); document.write( " $\"L=3W\"$
\n" ); document.write( " $\"L=3%2880%29\"$
\n" ); document.write( " $\"highlight%28L=240%29\"$
\n" ); document.write( " \n" ); document.write( "

\n" );