To find the ratio of shaded parts to unshaded parts, we can analyze the information given.
- Shaded Squares: 9
- Unshaded Squares: 6
Now, we calculate the ratio of shaded parts to unshaded parts:
\[ \text{Ratio of shaded to unshaded} = \frac{\text{Number of shaded squares}}{\text{Number of unshaded squares}} = \frac{9}{6} \]
Now we simplify this fraction:
\[ \frac{9}{6} = \frac{3}{2} \]
Thus, the ratio of shaded parts to unshaded parts is:
\[ \boxed{\frac{3}{2}} \]
This means that for every 3 shaded squares, there are 2 unshaded squares.