Question 418738
http://vyew.com/room#/365877/algebra.com
I would really like to work this problem for you at the above online whiteboard.
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Draw a rectangle and label the length 5x and the width 2x.  You are told that the length is 25 meters, so let 5x=25 and x=5 meters.  Then you can find your width of 10 meters and your perimeter of P=2L+2W=70 meters.