Question 574694
Since the length given is based off the width, lets denote the width as x. Since the length is given as "18 centimeters more than triple the width, that would give us: 
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Width: x
Length: (18+3x) 
Total=92
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If you consider the perimeter formula of a rectangle as 2L+2W, then you can replace the values we have:
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2(18+3x)+2x=92

You can simply solve for x from here:
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2(18+3x)+2x=92
36+6x+2x=92
36+8x=92
(36-36)+8x=(92-36)   <i> Subtract 36 from both sides</i>
8x=56
8x/8=56/8   <i>Divide by 8 to isolate x</i>
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x=7
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Width=7
Length=18+3(7)=39

To check, use the perimeter formula
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2L+2W
2(39)+2(7)=92