Answer:12 m
Step-by-step explanation:
Given
Width of garden [tex]W=8\ m[/tex]
Total fencing [tex]T=40\ m[/tex]
If Lulu has enough fencing to go around her rectangular garden then , it should be equal to perimeter of garden
Suppose L is the length of garden
Therefore perimeter is [tex]P=2(L+W)[/tex]
[tex]2(L+W)=40[/tex]
[tex]L+W=20[/tex]
[tex]L=20-8=12\ m[/tex]
thus length of fencing is [tex]12\ m[/tex]
