9. Uncle Zhang and Uncle Li's combined age is 56 years. When Uncle Zhang was half of Uncle Li's current age, Uncle Li's age at that time was Uncle Zhang's current age. So, Uncle Zhang is $\qquad$ years old now.
【Answer】 24
【Question Type】Word Problem: Age Problem
【Solution】Let Mr. Zhang's current age be $x$ years, and after reducing $y$ years, Mr. Zhang's age is half of Mr. Li's age, then Mr. Li's current age is $2(x-y)$
years, when Mr. Zhang is half of Mr. Li's current age, Mr. Li is $2(x-y)-y$ years old, then $\left\{\begin{array}{l}x+2(x-y)=56 \\ x=2(x-y)-y\end{array}\right.$, solving we get $\left\{\begin{array}{l}y=8 \\ x=24\end{array}\right.$, that is, Mr. Zhang is currently 24 years old.
This problem can also be solved using a line segment diagram method, students can think about it themselves!