Respuesta :

Let, the width = x
Then, length = x+4

Perimeter = 2(l+w)
Substitute their values, 
80 = 2(x+4+x)
80 = 2(2x + 4)
80 = 4x + 8
4x = 72
x = 72/4
x = 18
Also, x+4 = 22

In short, Length = 22 and Width = 18

Hope this helps!
the lenght is 4+x and the width is x so 2((4+x)+x)=80 》4X+8=80 》X=72/4=18