<PRE><B>Question 1138605</B>
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Calculate the width of the strip. 
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No.  You mean something else.
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).


Area of the cut tin sheet, 135 square cm
Area of uncovered examining area, 112-135=23 cm


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.</PRE>