Read the following information and answer the question: Dinesh, Ritesh, Rajesh…
2015
Read the following information and answer the question:
Dinesh, Ritesh, Rajesh and Ramesh are classmates. Dinesh and Ritesh study Physics and Biology. Rajesh and Dinesh study Physics and Mathematics. Ritesh and Ramesh study Chemistry and Physics. Rajesh and Ramesh study Chemistry and Mathematics.
Who among these students studies Mathematics, Biology and Physics?
- A.
Dinesh
- B.
Ritesh
- C.
Rajesh
- D.
Ramesh
Show answer & explanation
Correct answer: A
Concept
In a linked-attribute puzzle, each statement pairs two people with two shared subjects. A person's full subject profile is not fixed by a single sentence — it is the union of every subject pair attributed to them across all the statements that name them. Two statements about the same person must be merged before comparing that person against the question's target combination.
Application
Read every statement as a person-to-subject-pair link:
Statement 1 links Dinesh and Ritesh to Physics and Biology.
Statement 2 links Rajesh and Dinesh to Physics and Mathematics.
Statement 3 links Ritesh and Ramesh to Chemistry and Physics.
Statement 4 links Rajesh and Ramesh to Chemistry and Mathematics.
Each person is named in exactly two statements; merge those two subject pairs to get their combined profile:
Person | Combined Subject Profile (from the two statements naming them) |
|---|---|
Dinesh | Physics, Biology, Mathematics |
Ritesh | Physics, Biology, Chemistry |
Rajesh | Physics, Mathematics, Chemistry |
Ramesh | Physics, Chemistry, Mathematics |
The question's target combination is Mathematics, Biology, and Physics. Comparing each merged profile against this target identifies exactly one exact match.
Cross-check
Ritesh's profile carries Biology but no Mathematics, so it cannot equal the target combination.
Rajesh's and Ramesh's profiles both carry Mathematics but neither carries Biology, since Biology appears only in statement 1, which names Dinesh and Ritesh — so neither profile can equal the target.
That leaves only the profile built from statements 1 and 2 — Physics, Biology, and Mathematics — as the exact match for the target combination, confirming Dinesh.