1. **State the problem:** We have $n$ players on a sports team. Each player receives 5 pairs of Sox, but 4 pairs are kept in reserve (not given to the players directly). 2. **Understand the quantities:** - Each player gets 5 pairs of Sox. - There are $n$ players. - Additionally, 4 pairs are kept in reserve. 3. **Write the relation:** - Total pairs given to players: $5n$ - Total pairs in reserve: 4 - Total pairs needed: sum of pairs given to players and pairs in reserve 4. **Final relation:** $$\text{Total pairs} = 5n + 4$$ This relation shows the total number of pairs of Sox needed for $n$ players, including the reserve pairs.