ANSWER
[tex]\frac{2}{5}[/tex]EXPLANATION
To find the scale factor of the model to the sculpture, we have to divide one set of measurements of the model and sculpture.
Let us divide the length of the model by that of the sculpture:
[tex]\begin{gathered} \frac{10}{25} \\ \Rightarrow\frac{2}{5} \end{gathered}[/tex]That is the scale factor of the model to the real sculpture.