+600 I see you are doing AoPS Prealgebra! Great course, I hope you have fun. On the alcumus forum, you can ask for help with alcumus problems.
Notice that the yes portion is $\frac{24}{36+24}$ of the whole. Now, the whole is $360^{\circ}$. Can you use this to find $\angle ACB=\text{ the yes portion }$?
If you don't understand angles very well, ask your teacher or your peers on the tab that says "Message board". They will be happy to help 
