‘Q + R’ means ‘Q is the father of R’‘Q – R’ means ‘Q is the wife of R’‘Q × R’ means ‘Q is the brother of R’‘Q ÷ R’ means ‘Q is the daughter of R’If the expression is ‘S ÷ Q + M × P − K’, then how is Q related to K?

Let's decode the given expression step-by-step from left to right:S ÷ Q $\to$ S is the daughter of Q.Q + M $\to$ Q is the father of M. (So Q is male, and S and M are siblings).M × P $\to$ M is the brother of P. (So S, M, P are siblings, all children of Q).P − K $\to$ P is the wife of K. (So P is female, married to K, who is male).Since P is the daughter of Q, and P is married to K, Q is the father of K's wife.Therefore, Q is the Father-in-law of K.