The scales show things in the left and right pans that balance each other.

Based on that, choose the answer that shows two groups of shapes that, when placed on the scale, would also be of equal weight.

 

1 circle is equal to 2 squares. If the same shapes are added to or taken away from both sides, the weight balance will not change. By adding one circle and two squares on the left side while two circles are added on the right side.

Based on this, Option 3 is the correct answer.