SOLUTION: If length of a rectangle is twice the width and it's perimeter is 30. What the width and its length?

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Question 1006117: If length of a rectangle is twice the width and it's perimeter is 30. What the width and its length?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Call the length and width, L and W. Then we have
L = 2W and
Perimeter P = 2L + 2W = 30
Now substitute and get
2(2W) + 2W = 30
4W + 2W = 30
6W = 30
W = 5 and then
L = 10