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In a certain code language, ‘A + B’ means ‘A is the mother of B’, ‘A − B’ means ‘A is the brother of B’, ‘A × B’ means ‘A is the wife of B’, and ‘A ÷ B’ means ‘A is the father of B’. How is T related to O if ‘P + N − S ÷ O + M × T’?
Son’s son
Son
Daughter’s husband
Daughter’s son
Daughter’s husband
Break the expression into individual relations (A, B) and construct a generation hierarchy from left to right, focusing on the gender of the final subject.
Break the expression into individual relations (A, B) and construct a generation hierarchy from left to right, focusing on the gender of the final subject.
Deconstruct the expression
P + N means P is mother of N. N - S means N is brother of S. S ÷ O means S is father of O. O + M means O is mother of M. M × T means M is wife of T.
Build the family tree
P (female) is parent of N (male). N is brother of S. S (male) is father of O. O (female) is mother of M. M (female) is wife of T (male).
Determine T's relation to O
Since O is the mother of M, and M is the wife of T, T is the husband of O's daughter. Therefore, T is the son-in-law of O.
A: Son's son is incorrect as T is the husband of O's daughter, not the son of O's son. B: Son is incorrect because T is linked through marriage to O's daughter, making him a son-in-law. D: Daughter's son is incorrect as M is T's wife, not T's daughter.
C is correct because the sequence M wife of T and O mother of M establishes that T is the husband of O's daughter.
In coded blood relations, always check the gender of the last person mentioned; if the relationship code defines them as a husband or wife, they must be the spouse of the previous generation's child.