Direction : Read the given information carefully and answer the given…
2021
Direction : Read the given information carefully and answer the given questions based on it.:
Seven persons S, E, V, B, A, D and U sit in a row facing north and they all work in a company with different working experience of 15yr, 7yr, 2yr, 23yr, 19yr, 6yr and 12yr. All the information is not necessarily in the same order as given. The persons with vowel name have experience of even number year and neither sits at the end nor at exactly middle of the row. Three persons sit between S and the one having 23yr experience. One person sits between S and A. The number of persons sits to the right of A is same as the number of persons sits to the left of the one having experience 2.5 times of A. B neither have highest year experience nor sits adjacent to S. The person having least experience sits second to the left of D. U does not have least experience. The neighbors of B have more experience than B.
Who among the following sits fourth to the left of the one having 7yr experience?
Answer: B. A — Concept: In a row-arrangement puzzle, translate each statement into a position or value constraint. Start with forced value groups, propagate the resulting…
- A.
V
- B.
A
- C.
E
- D.
D
- E.
None of these
Attempted by 44 students.
Show answer & explanation
Correct answer: B
Concept: In a row-arrangement puzzle, translate each statement into a position or value constraint. Start with forced value groups, propagate the resulting seat relations, and accept an arrangement only when every clue is satisfied together.
Application
The vowel-named persons E, A and U must take the even experiences 2, 6 and 12 years. The value 2.5 times A’s experience must also occur in the list; only 6 gives a listed result because 2.5 × 6 = 15. Hence A has 6 years. Since U is not the least experienced, E has 2 years and U has 12 years.
Let positions be numbered 1 to 7 from left to right. If A is at position a, the equal-count clue gives 7 − a = p₁₅ − 1, so the 15-year person is at position 8 − a. Also, S is two seats away from A, while S and the 23-year person are four seats apart.
The permitted non-end, non-middle positions for A are 2, 3, 5 and 6. Positions 2 and 6 cannot place a 23-year person four seats from S. If A were at position 5, the 15-year person would be at position 3. S must then be at position 3, because placing S at position 7 would require the same position 3 to hold both 15 and 23 years; consequently the 23-year person would be at position 7. The least-experience relation forces E to position 2 and D to position 4, with U at position 6. B and V would remain for positions 1 and 7; since B cannot have 23 years, V would be at 7 and B at 1. E has 2 years, while B would have 7 or 19 years, so E’s experience would not be greater than B’s, contradicting the neighbour clue. Therefore A is at position 3, S at position 5, the 15-year experience belongs to S, and the 23-year person is at position 1.
E has the least experience, 2 years, and sits second to the left of D. With A at position 3 and the vowel-seat restrictions, E must be at position 2, D at position 4 and U at position 6. The remaining persons occupy positions 1 and 7; because B cannot have 23 years, V is at position 1 with 23 years and B is at position 7 with 7 years. D therefore has 19 years.
The completed row is unique and is shown below.
Position | Person | Experience (years) |
|---|---|---|
1 | V | 23 |
2 | E | 2 |
3 | A | 6 |
4 | D | 19 |
5 | S | 15 |
6 | U | 12 |
7 | B | 7 |
Cross-check
Cross-check: B’s only neighbour is U with 12 years, which is greater than B’s 7 years. S and V have three persons between them, S and A have one person between them, E is second to the left of D, and the equal-count relation gives four persons to A’s right and four persons to S’s left.
Result
Result: The 7-year person is B at position 7. Moving four places to the left reaches position 3, occupied by A. Therefore A sits fourth to the left of the 7-year person.