Hi,

Let x represent the width.  Then length is (x-3)

Perimeter of a rectangle is 2*l + 2*w

2(x-3) + 2x = 114cm

Solve

2x - 6 + 2x = 114cm

4x = 120cm

x = 30cm is the width of the rectangle



checking our answer

2*27cm + 2*30cm = 114cm 

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