11. (9 points) The number of chickens grandma raises is 4 times the number of ducks, and there are 600 more chickens than ducks. How many chickens and ducks does grandma raise?

保持了原文的换行和格式。
【Answer】Solution: $4-1=3$
$$
\begin{array}{l}
600 \div 3=200 \text { (only) } \\
200+600=800 \text { (only) }
\end{array}
$$

Answer: There are 800 chickens, and 200 ducks.