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If A + B means A is the father of B, A - B means A is the mother of B, and A * B means A is the brother of B, then what does P - Q * R + S signify?
P is the grandmother of S
P is the mother of R
P is the aunt of S
P is the sister of Q
P is the grandmother of S
Break the expression into individual relations (A-B, B-C, etc.) and construct a simple parent-child hierarchy to instantly trace the generations.
Break the expression into individual relations (A-B, B-C, etc.) and construct a simple parent-child hierarchy to instantly trace the generations.
Analyze P - Q
P - Q means P is the mother of Q. (P is the parent of Q, Female).
Analyze Q * R
Q * R means Q is the brother of R. Since P is the mother of Q, P is also the mother of R.
Analyze R + S
R + S means R is the father of S. Since P is the mother of R, and R is the father of S, P is the mother of the father of S.
Determine the relationship
The mother of one's father is defined as the grandmother. Therefore, P is the grandmother of S.
B: P is the grandmother of S, not just the mother of R; C: P is the grandmother, not aunt (aunt would be the sibling of the father); D: P is the mother of Q, not the sister.
A is correct because the expression P-Q*R+S establishes P as the mother of Q, Q as the brother of R, and R as the father of S, making P the paternal grandmother of S.
In coded blood relations, always look at the generation gap first; P-Q*R+S involves three generations (PtoS), which immediately narrows down options involving 'mother' or 'sister'.