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In a certain code language, ‘A + B’ means ‘A is the brother of B’, ‘A − B’ means ‘A is the mother of B’, ‘A × B’ means ‘A is the wife of B’ and ‘A ÷ B’ means ‘A is the father of B’. How is B related to L if ‘B × G ÷ T + K − L’?
Father’s father
Mother’s mother
Sister’s daughter
Brother’s daughter
Mother’s mother
Break the expression into segments: B*G, G/T, T+K, K-L. Use a gender-based family tree: B(wife of G) → G(father of T) → T(brother of K) → K(mother of L).
Break the expression into segments: B*G, G/T, T+K, K-L. Use a gender-based family tree: B(wife of G) → G(father of T) → T(brother of K) → K(mother of L).
Analyze the expression segments
B x G means B is the wife of G (B is female, G is male). G / T means G is the father of T. T + K means T is the brother of K. K - L means K is the mother of L.
Trace the relationship sequence
Since G is the father of T and T is the brother of K, G is also the father of K. Since K is the mother of L, G is the maternal grandfather of L. Since B is the wife of G, B is the maternal grandmother of L.
A is incorrect because B is female and cannot be a father; C is incorrect because L is the grandchild, not daughter; D is incorrect because K is the daughter of B, but B is related to L as a grandparent.
B is correct because B is the wife of G, who is the maternal grandfather of L (being the father of K, who is the mother of L), making B the maternal grandmother (mother's mother).
Always determine the gender of the subject first using the last operation; if the subject (B) is female, options like Father's father are immediately impossible.
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