document.write( "Question 1138605: 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
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document.write( "What I have got so far: At - As = 112
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document.write( "At = 135\r
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document.write( "135 - As = 112
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document.write( "23 = As\r
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document.write( "23 = (15-2x) (9-2x)
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document.write( "4x^2 - 12x + 28
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document.write( "4(x^2 -12x +28)
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document.write( "x=14 \n" );
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