Question 262612
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Clint is constructing two adjacent rectangular dog pens. Each pen will be three times as long as it is wide, 
and the pens will share a common long side. If clint has 65 ft of fencing, what are the dimensions of each pen?
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        The solution in the post by @mananth is incorrect conceptually: he incorrectly setup his governing equation.

        I came to bring a correct solution.



<pre>
Let x be width of the pens, in feet.
Then their length is 3x feet, according to the problem.


We have 3 long sides of the length 3x ft each, and 4 short sides of the length x ft each.


So, the total length of all dimensions is   3*(3x) + 4x.

Therefore, the equation for the total fence length is

    3*(3x) + 4x = 65  feet.


Simplify and find x

    13x = 65,

      x = 65/13 = 5 feet.


<U>ANSWER</U>.  The dimensions of each pen are  5 ft x 15 ft.
</pre>

Solved correctly.


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Thanks to tutor @greenestamps for noticing my typo.
I just fixed it.