Question
If Roll no 31 sits immediately before Roll no 23, then who sits immediately after 24?
Answer: Option D
:
D
31 is sitting immediately before 23
1: 24 on 5th Bench and 27 on 6th Bench
3112323424527678910
This case is not the best case because we have to seat 25 and 32 as far as possible is at extreme ends.
Case 2: 24 on 6th Bench and 27 on 5th Bench
2513122333042757893210
26 and 28 sit on consecutive seats is either on 7th and 8th Bench or on 8th and 9th Bench and 29 can sit on 7th,8thor9th
Bench
Therefore 30 sits on 4th Bench
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:
D
31 is sitting immediately before 23
1: 24 on 5th Bench and 27 on 6th Bench
3112323424527678910
This case is not the best case because we have to seat 25 and 32 as far as possible is at extreme ends.
Case 2: 24 on 6th Bench and 27 on 5th Bench
2513122333042757893210
26 and 28 sit on consecutive seats is either on 7th and 8th Bench or on 8th and 9th Bench and 29 can sit on 7th,8thor9th
Bench
Therefore 30 sits on 4th Bench
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