The age of Sachin is 4 times that of his son. Five years ago, Sachin was nine times as old as his son was at that time. The present age of the Sachin is

 

Let present age of sachin's son is x years.
Sachin's age =4x
According to question,
 $$\begin{gathered} (4x-5)=9\times (x-5) \\ \Rightarrow 4x-5=9x-45 \\ \Rightarrow 5x=40 \\ \Rightarrow x=8 \end{gathered}$$
Hence, Percentage of Sachin $=4\times 8=32$ years.