A, B, C, D, E and F live on six different floors of the same building. The lowermost floor in the building is numbered 1, the floor above it, number 2 and so on till the topmost floor is numbered 6.
F lives on an even numbered floor but not 6. The sum of floors on which D and F live is 7. B lives immediately above A. The sum of floors on which F and C live is 3. How many people live between B and F?

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RRB NTPC Graduate Level CBT-I Official Paper (Held On: 06 Jun, 2025 Shift 1)
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  1. One 
  2. Four
  3. Three
  4. Two

Answer (Detailed Solution Below)

Option 1 : One 
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Detailed Solution

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Given: A, B, C, D, E and F live on six different floors of the same building. The lowermost floor in the building is numbered 1, the floor above it, number 2 and so on till the topmost floor is numbered 6.

1) F lives on an even numbered floor but not 6.

2) The sum of floors on which F and C live is 3.

Floors Person
6  
5  
4  
3  
2 F
1 C

3) The sum of floors on which D and F live is 7.

4) B lives immediately above A.

After positioning B and A only one position is left which will be occupied by the only person left i.e. E.

Floors Person
6 E
5 D
4 B
3 A
2 F
1 C

Thus, one person live between B and F.

Hence, "Option 1" is the correct answer.

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