Civil Service Exam Reviewer · Logical Reasoning · hard
In a certain code, P + Q means "P is the father of Q," P − Q means "P is the sister of Q," and P × Q means "P is the mother of Q." If A + B − C × D, how is A related to D?
- Father
- Grandfather
- Uncle
- Great-grandfather
Answer
B. Grandfather
Solution
A + B: A is the father of B. B − C: B is the sister of C, so A is also the father of C. C × D: C is the mother of D. A is the father of D's mother, so A is D's grandfather.
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