13. (5 points) To repair a section of road, 24 people can complete it in 12 days. Now, after 24 people have worked for 4 days, 8 more people are added. It will take $\qquad$ more days to complete the repair.
【Solution】Solve: $24 \times(12-4) \div(24+8)$
$$
\begin{array}{l}
=24 \times 8 \div 32 \\
=6 \text { (days) }
\end{array}
$$

Answer: It will take another 6 days to complete the repair.
Therefore, the answer is: 6