In a certain language,

A & B means A is the wife of B,

A ÷ B means A is the mother of B,

A × B means A is the son of B,

A + B means A is the sister of B and

A @ B means A is the father of B.

If A @ B & C @ D + K ÷ F, how is C related to K?

The correct option is Father.

Let's decode the given symbols and step-by-step relations in the expression A @ B & C @ D + K ÷ F:

1. A @ B ⇒ A is the father of B.
2. B & C ⇒ B is the wife of C (this implies B is female and C is male, so C is the husband of B).
3. C @ D ⇒ C is the father of D.
4. D + K ⇒ D is the sister of K.
5. K ÷ F ⇒ K is the mother of F.

To find how C is related to K:

- C is the father of D (from C @ D).
- D is the sister of K (from D + K), which means D and K are siblings sharing the same parents.

Since C is the father of D, C must also be the father of K. Therefore, C is the Father of K.