20.7. There are four barrels. The first one holds 24 buckets, the second 13, the third 11, and the fourth 5. The first barrel is filled with water, while the other barrels are empty. How can you divide the water into three equal parts?

## 20.3. Tournaments

When solving problems about tournaments, you need to know the following rules:

a) in volleyball, there are no ties;

b) in chess, 1 point is awarded for a win, 1/2 point for a draw, and 0 points for a loss.
20.7. The following pourings can be applied:

$$
\begin{aligned}
& (24,0,0,0) \rightarrow(19,0,0,5) \rightarrow(8,0,11,5) \rightarrow \\
& \quad \rightarrow(8,11,0,5) \rightarrow(0,11,8,5) \rightarrow(0,13,8,3) \rightarrow(8,13,0,3) \rightarrow \\
& \quad \rightarrow(8,13,3,0) \rightarrow(8,8,3,5) \rightarrow(8,8,8,0)
\end{aligned}
$$