Answer:
[tex]\frac{5}{3}[/tex]
Step-by-step explanation:
Given that the triangles are similar then the ratios of corresponding sides are equal.
To determine the scale factor calculate the ratio of corresponding sides, that is
[tex]\frac{NO}{GH}[/tex] = [tex]\frac{15}{9}[/tex] = [tex]\frac{5}{3}[/tex]
