Question 427695
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Hi
length is 3 times its width
Let x and 3x represent the width and length respectively
Question states***
 2*3x + 2x = 24
   8x = 24
    x = 3, the width, the length is 9  (3*3)

CHECKING our Answer***
 2*9 + 2*3 = 24
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/PerimeterRectangle.svg/200px-PerimeterRectangle.svg.png">