Eight boys B1, B2, B3, B4, B5, B6 and B8 are sitting in a row facing towards the north (not necessarily in the same order). B6 is fifth to the right of B1. B4 is fifth to the right of B5. B5 is to the immediately right of B1. B8 is third to the left of B4. B2 is third of the right of B7. B7 is an immediate neighbour of B1. Who is sitting immediately left of B1?
a) B8
b) B2
c) B7
d) B6
Ans : c) B7
SSC Constable GD : 20 Feb 2024 (Shift I)
Solution:
Clues:
- B6 is fifth to the right of B1.
- B4 is fifth to the right of B5.
- B5 is immediately to the right of B1.
- B8 is third to the left of B4.
- B2 is third to the right of B7.
- B7 is an immediate neighbor of B1.
Step-by-Step Arrangement:
- Since B5 is immediately to the right of B1, let’s place them as follows: B1, B5
- B6 is fifth to the right of B1: Place B6 such that there are 4 boys between B1 and B6: B1, B5, , , _, B6
- B4 is fifth to the right of B5: Since B5 is next to B1, B4 should be fifth to the right of B1: B1, B5, , , _, B6, B4
- B8 is third to the left of B4: Place B8 such that there are 2 boys between B8 and B4: B8, , , B4
- B7 is an immediate neighbor of B1: B7 can be either to the left or right of B1. Since B5 is already to the right, B7 must be to the left: B7, B1, B5, , , _, B6, B4
- B2 is third to the right of B7: Place B2 such that there are 2 boys between B7 and B2: B7, B1, B5, B2, , , B6, B4
- Remaining Boy: B3 is the only boy left to place. He fits into the remaining spot: B7, B1, B5, B2, B3, B8, B6, B4
Final Arrangement:
B7, B1, B5, B2, B3, B8, B6, B4
Conclusion:
B7 is sitting immediately to the left of B1. So, the correct answer is B7.