document.write( "Question 851120: The length of a rectangle is twice it's width. If it's perimeter is 54cm, find its length. Explain! \n" ); document.write( "
Algebra.Com's Answer #512595 by ramkikk66(644)\"\" \"About 
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document.write( "The length of a rectangle is twice it's width. If it's perimeter is 54cm, find its length. Explain!\r\n" );
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document.write( "Solution:\r\n" );
document.write( "Let the width be x cm\r\n" );
document.write( "Then the length = 2*x cm\r\n" );
document.write( "Perimeter = 2*(length + width) = \"2%2A%28x+%2B+2%2Ax%29\" = \"2%2A3%2Ax\" = \"6%2Ax+=+54\"\r\n" );
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document.write( "Solving, \"x+=+54%2F6+=+9\"\r\n" );
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document.write( "So width = \"highlight%289%29\" cm and length = \"highlight%2818%29\" cm\r\n" );
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document.write( "Check: Perimeter = \"2%2A%289%2B18%29+=+54\". Correct!\r\n" );
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