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In a certain code language, A + B = A is the husband of B, A - B = A is the brother of B, A × B = A is the father of B, and A ÷ B = A is the son of B. How is P related to S if P × Q - R + S?

  • A.Brother-in-law
  • B.Brother
  • C.Father-in-law
  • D.Father

Answer: C

P x Q - R + S gives: P is the father of Q, Q is the brother of R, and R is the husband of S. So P is the father of R, and R is the husband of S, which makes P the father-in-law of S.

Brother-in-law and brother would be the relations of a person of the same generation as S, and father alone would ignore that the link goes through S's husband R. So P is S's father-in-law.

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