Question 1177100
Yard?  Garden?  What, which?

Part of the YARD is torn up, to be used for the surrounding sidewalk.  How the "garden" is meant can be ignored (maybe).


x, the uniform width inside the original garden, to be torn up and replaced with sidewalk


{{{80*60}}}, area of original region

{{{(80-2x)(60-2x)}}}, area of remaining "yard"

{{{80*60-(80-2x)(60-2x)}}}, area of the sidewalk



You should be able to refer again to the description and maybe continue to solve on your own.