There are four sides to a rectangle, the width is W and so the length is 2W, and we can put that in this equation: W + W + 2W + 2W = 30 feet.

If we add the sides together, we get 6W = 30 feet.

To find W, we divide both sides by 6, like this: 6W / 6 = 30 feet / 6, so W = 5 feet.

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Josh built his little brother a rectangular sandbox.  The perimeter of the sandbox is 30 feet and the length is twice the width. What is the width of the sandbox?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
Josh built his little brother a rectangular sandbox.  The perimeter of the sandbox is 30 feet and the length is twice the width. What is the width of the sandbox?
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