document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1138605>Question 1138605</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A rectangular sheet of tin is 15cm long and 9cm wide. A uniform strip is to be cut off around the sheet. The examining area is 112cm squared. Calculate the width of the strip. The answer is 0.5 cm.\r<BR>\n" );
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document.write( "What I have got so far: At - As =  112 <BR>\n" );
document.write( "At = 135\r<BR>\n" );
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document.write( "135 - As = 112<BR>\n" );
document.write( "23 = As\r<BR>\n" );
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document.write( "23 = (15-2x) (9-2x)<BR>\n" );
document.write( "4x^2 - 12x + 28<BR>\n" );
document.write( "4(x^2 -12x +28)<BR>\n" );
document.write( "x=14 </SPAN>\n" );
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document.write( "Calculate the width of the strip. <BR>\n" );
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document.write( "No.  You mean something else.<BR>\n" );
document.write( "Calculate the uniform width of the area surrounding the cut sheet on tin on the rectangular examining area  (assuming that the two are similar rectangles).\r<BR>\n" );
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document.write( "Area of the cut tin sheet, 135 square cm<BR>\n" );
document.write( "Area of uncovered examining area, 112-135=23 cm\r<BR>\n" );
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document.write( "Problem description does not give a way to relate the examining area to the rectangular cut sheet of tin.   One can only assume and not really know that the examining area is the same dimensions as the UNCUT sheet of tin. </SPAN>\n" );
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