UPSC Prelims 2017 · CSAT
Question 72: Logical Reasoning and Mental Ability
In a school, there are five teachers A, B, C, D and E. A and B teach Hindi and English. C and B teach English and Geography. D and A teach Mathematics and Hindi. E and B teach History and French. Who teaches maximum number of subjects?
AnswerUPSC’s answer is (b).
Count the subjects each teacher handles. A: Hindi, English and Mathematics, so 3. B: Hindi, English, Geography, History and French, so 5. C: English and Geography, so 2. D: Mathematics and Hindi, so 2. E: History and French, so 2. B teaches the most, with five subjects. Build a teacher-by-subject list from the pairs rather than counting the pairs themselves.
Why each option is right or wrong
- (a) A teaches 3 subjects.
- (b) Correct: B teaches 5 subjects.
- (c) D teaches 2 subjects.
- (d) E teaches 2 subjects.
Answer: UPSC’s key. Explanation: written by UPSC Grade, not by UPSC.
Source: UPSC, Civil Services (Preliminary) Examination 2017, General Studies Paper II (CSAT), Series A. The paper on upsc.gov.in.