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In a code language: A + B is 'A is the mother of B', A - B is 'A is the father of B', A * B is 'A is the sister of B', and A / B is 'A is the brother of B'. How is Q related to S in the expression: Q + R - S * T?
Grandmother
Mother
Aunt
Sister
Grandmother
Break the expression into segments from left to right; map Q to R, then R to S, then S to T, and identify the gender of Q relative to S.
Break the expression into segments from left to right; map Q to R, then R to S, then S to T, and identify the gender of Q relative to S.
Analyze the expression Q + R
Given A + B means A is the mother of B. Therefore, Q + R means Q is the mother of R.
Analyze the expression R - S
Given A - B means A is the father of B. Therefore, R - S means R is the father of S.
Determine the relationship between Q and S
If Q is the mother of R, and R is the father of S, then Q is the mother of the father of S. The mother of one's father is the grandmother.
B: Mother is incorrect because Q is the parent of the father of S, not the immediate parent. C: Aunt is incorrect because Q is directly linked to the father of S in the generation above. D: Sister is incorrect because Q is two generations above S, not the same generation.
A is correct because Q is the mother of R, and R is the father of S; thus, Q is the paternal grandmother of S.
In blood relation questions involving multiple generations, always map the gender of the subject (Q) first to quickly eliminate opposite-gender options.