



 
Hi Micheal, The first thing I did was to type 0.4 acres in square feet into the Google search window. Google responded with 0.4 acre = 17424 square feet. If the properly is a rectangle, 25 feet along the front and $x$ feet along the side then the back is also 25 feet long and the remaining side is $x$ feet long. Thus $25 \times x = 17425.$ Solve for $x.$ If the property is not a rectangle Then you need more information.  


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