Encoded relations (+ mother, − brother, % father, × sister): Make P the maternal uncle of Q. Find the expression that ensures “P is the brother of Q’s mother”. Choose the correct option.

Decode the correct chain

• P − M: P is the brother of M.
• M + N: M is the mother of N.
• N × Q: N is the sister of Q ⇒ N and Q are siblings ⇒ they share mother M.

Conclusion
M is Q's mother and P is M's brother ⇒ P is Q's maternal uncle.

Why others don’t work

• Q − N + M × P links P as sibling of M, but M isn’t shown as Q's mother.
• P + S × N − Q makes P a mother, not an uncle.
• Q − S % P relates S and P as father/child; no maternal link to Q.