Answer:
80 ft x 40 ft
Step-by-step explanation:
Let 'L' be the length of the longer side and 'W' be the length of the shorter side (or the width).
The equations that compose the linear system are:
[tex]L+2W=160\\L=2W[/tex]
Solving the system:
[tex]L+L=160\\L=80\\W=\frac{L}{2}\\W=40[/tex]
The garden is a rectangle with dimensions 80 ft x 40 ft.