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In a certain code language, ‘A + B’ means ‘A is the wife of B’, ‘A − B’ means ‘A is the father of B’, ‘A × B’ means ‘A is the sister of B’, and ‘A ÷ B’ means ‘A is the mother of B’. How is Q related to Y if ‘Q + K − T × D ÷ Y’?
Mother’s mother
Mother’s brother
Father
Father’s father
Mother’s mother
Break the expression into individual pairs: Q+K (Q wife of K), K-T (K father of T), T*D (T sister of D), D/Y (D mother of Y). Trace the generation gaps from Q down to Y.
Break the expression into individual pairs: Q+K (Q wife of K), K-T (K father of T), T*D (T sister of D), D/Y (D mother of Y). Trace the generation gaps from Q down to Y.
Analyze the expression Q + K - T * D / Y
Break the code sequentially: 1. Q + K: Q is wife of K (Q is Female, K is Male). 2. K - T: K is father of T. 3. T * D: T is sister of D (T is Female). 4. D / Y: D is mother of Y (D is Female).
Establish the family lineage
Since K is the father of T, and T is the sister of D, K is also the father of D. Since Q is the wife of K, Q is the mother of D. D is the mother of Y. Therefore, Q is the mother of the mother of Y.
B: Incorrect, because Q is female and identified as the mother of the parent of Y, not a brother. C: Incorrect, because Q is female, so she cannot be the father. D: Incorrect, because Q is the mother of the mother, not the father of the father.
A is correct because the breakdown identifies Q as the mother of D, and D as the mother of Y, making Q the maternal grandmother (mother's mother) of Y.
In coded blood relations, always determine the gender of the subject first to eliminate gender-mismatched options quickly.
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