The riddle "How does four sevens make 9?" relies on lateral thinking rather than strict mathematical operations. There are a few creative interpretations, and here is one possible explanation:

By arranging four sevens creatively:

• $7 + 7 - 7 / 7 = 9$

In this case:

1. Add two sevens: $7 + 7 = 14$
2. Subtract the result of dividing the remaining sevens: $7 / 7 = 1$
3. So, $14 - 1 = 13$.

In this case