help so u can get points

12:20 = [tex]\frac{3}{5}[/tex]
15:25 = [tex]\frac{3}{5}[/tex]
3:5 = [tex]\frac{3}{5}[/tex]
9:15 = [tex]\frac{3}{5}[/tex]
All the rectangles are similar because they all have identical lenght to width ratios.
Hope that helps!