SOLUTION: The length of a rectangle is twice it's width. If the perimeter is 54cm find it's width

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Question 591200: The length of a rectangle is twice it's width. If the perimeter is 54cm find it's width
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
The length of a rectangle is twice it's width. If the perimeter is 54cm find it's width
.
Let w = width
then
2w = length
.
since:
perimeter = 2(width+length)
we have
54 = 2(w + 2w)
54 = 2(3w)
27 = 3w
9 cm = w (width)