Since the question is asking for the perimeter, you have to find the length of the sides of the rectangle.
If one of the sides has a length of 5 yards, then the side parallel to that side also has a length of 5 yards.
So you have to multiply 5 with 2
5×2=10
If the other side has a length of 3 yards, then the side parallel to that side also a length of 3 yards
So you have to multiply 3 with 2
3×2=6
Then you add the two answers
10+6=16
So you get 16 yards
Hope this helps!