problem: What is the simplified numerical value of $\frac{a+11b}{a-b}$ if $\frac{4a+3b}{a-2b}=5$?
solution: Let's play with the given condition a little. Clearing out the denominator gives $4a+3b=5(a-2b)=5a-10b$. Selectively combine like terms by adding $9b-4a$ to both sides to get $12b=a-b$. This gives $\dfrac{12b}{a-b}=1$.
  
  Now, we want to find $\dfrac{a+11b}{a-b}$. Rewrite this as $\dfrac{a-b+12b}{a-b}=\dfrac{a-b}{a-b}+\dfrac{12b}{a-b}=1+1=\boxed{2}$, and we are done.