we are given
width=3feet
Let's assume
length=l
perimeter=54
[tex] 2(l+3)=54 [/tex]
now, we can solve for l
[tex] (l+3)=27 [/tex]
[tex] l=24 [/tex]
now, we can find area
[tex] Area=length*width [/tex]
we can plug values
and we get
[tex] Area=24*3 [/tex]
[tex] Area=72 [/tex]...........Answer