Question 1175469
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<pre>

    x + 9x <= 240/2

    
      10x  <= 120


        x   <= 120/10 = 12.

 
The dimensions of the rectangle are  (x,9x)  with  x <= 12 feet.
</pre>

Solved.


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In your post, you did not specify variable x.


In my solution, x is the width of the rectangle (the shorter side).