Ans.Let the length of rectangular garden and width of rectangular garden be x metres and y metres respectively.
Given, the perimeter = 36m
=>\(x + y = 36\).......(i)
Also \(x = y + 4\)
=>\(x - y = 4\)........(ii)
On adding equation (i) and (ii),
=>\(2x = 40\)
=>\(x = 20\)m
On subtracting equation (ii) from (i),
=>\(2y = 32\)
=>\(y = 16\)m
Hence , length = 20 m and width = 16 m.