Given operator meanings: A + B means “A is the father of B” A − B means “A is…
2023
Given operator meanings: A + B means “A is the father of B”
A − B means “A is the mother of B”
A × B means “A is the sister of B”
A ÷ B means “A is the brother of B”
Based on the above, if S − G ÷ T − M × P + R , then how is S related to P ?
- A.
Father’s mother
- B.
Sister
- C.
Mother
- D.
Mother’s mother
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Correct answer: D
S − G : S is mother of G.
G ÷ T : G is brother of T ⇒ G and T are siblings. Since S is mother of G, S is also mother of T.
T − M : T is mother of M ⇒ S (mother of T) is grandmother of M (i.e., mother’s mother of M).
M × P : M is sister of P ⇒ M and P are siblings (same parents). So S (grandmother of M) is also grandmother of P.
P + R : P is father of R — this does not change S’s relation to P.
Therefore S is the mother of P’s mother = P’s maternal grandmother = mother’s mother (Mother’s mother
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