SOLUTION: Perimeter of pool is 30ft. Length is twice as long as width. What is lenght?

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Question 221440: Perimeter of pool is 30ft. Length is twice as long as width. What is lenght?
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Start with the perimeter formula:
P+=+2%28L%2BW%29 Substitute P = 30 and L = 2W.
30+=+2%282W%2BW%29%5D%5D%5D+Simplify.%0D%0A%7B%7B%7B30+=+2%283W%29
30+=+6W Divide both sides by 6.
5+=+W
The length is 2W, so...
L+=+10ft.