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1 Let its width be x and its perimeter change to 21.98 cm

2 So: 2(7.45+x) = 21.98

3 Or: 14.9+2x = 21.98

4 Therefore: 2x + 21.98-14.9 => 2x = 7.08

5 Then: x = 7.08/2 => x = 3.54

6 Width = 3.54 cm

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Q: What is the width of a rectangle that has a length of 7.45 cm and a perimeter of 219.8 mm showing work?
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