She has no sister or daughter — Aptitude Question
She has no sister or daughter: Pointing to a photograph of a girl, Rajesh said, 'She has no sister or daughter, but… Answer and worked solution on CodeKairo.
- Topic: Blood Relations
- Section: Logical Reasoning
- Difficulty: Hard
- Time target: 105 seconds
Question
Pointing to a photograph of a girl, Rajesh said, 'She has no sister or daughter, but her mother is the only daughter of my mother.' How is the girl related to Rajesh?
Options
- Daughter
- Niece
- Sister
- Cousin
Show the answer and the worked solution
Correct answer: B. Niece
Worked solution
- The only daughter of Rajesh's mother is Rajesh's sister (Rajesh is male, so it is not himself).
- The girl's mother is that sister.
- The girl is Rajesh's sister's daughter — his niece.
Answer: Niece.
The idea
Compare with the version where the speaker is a woman: there the phrase resolves to the speaker herself. The speaker's own sex decides it.
Shortcut. A male speaker's 'only daughter of my mother' is his sister, so the girl's mother is Rajesh's sister — and a sister's daughter is a niece.
Common trap. "Daughter" — applying the woman-speaker rule, where 'the only daughter of my mother' is the speaker herself; Rajesh is male, so it must be his sister.