imc

Notice that we don't need to find what $A,B,$ and $C$ actually are, just their average. In other words, if we can find $A+B+C$, we will be done. Adding up the equations gives $1001(A+B+C)=9009=1001(9)$ so $A+B+C=9$ and the average is $\frac{9}{3}=3$. Our answer is $\boxed{3}$.