A. P is the sister of S
B. P is the mother of S
C. P is the grandmother of S
D. P is the aunt of S
Best answer
Answer: C. P is the grandmother of S
Answer: (C) P is the grandmother of S
P + Q: P is the mother of Q. Q − R: Q is the brother of R, so P is the mother of R too. R × S: R is the father of S. Hence P is the mother of S's father, i.e. the grandmother of S.
Convention: only the relations stated are used; a brother or sister shares both parents, and a person's gender is known only from words such as mother, father, son, daughter, brother, sister, man or woman.
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