Problem 2. Zoki cycled $64 \%$ of the way, and walked the remaining $9 \mathrm{~km}$. How many kilometers did Zoki cycle?
Solution. The $9 \mathrm{~km}$ remaining represents $100-65=36 \%$ of the entire journey. Therefore, the entire journey is $9 \mathrm{~km} \cdot \frac{100}{36}=25 \mathrm{~km}$. Thus, Zoki on the bicycle traveled $25-9=16 \mathrm{~km}$.