The mean of the perimeters of 3 square closets is 36 feet. Can you find the mean side length of the closets?

The mean of the perimeters of 3 square closets is 36 feet. Can you find the mean side length of the closets? If so, what is it? If not, show why not by using an example
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Perimeter of a square is 4a where a is the side length. The mean is the sum of the perimeters divided by 3.

If b and c are the side lengths of the other two closets, then 4a+4b+4c=3×36=108.

So a+b+c=108/4=27 and the mean side length is 27/3=9ft.

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