Direction: Study the following information to answer the given questions:
Seven persons M, N, O, P, Q, R and S live on different floors of a 7-storey building. The lowermost floor is numbered as 1, floor above it as 2 and so on. N lives two floors above R’s floor. M does not live on prime numbered floor. Three persons live between R and P’s floor. O lives just above S’s floor. P lives on prime numbered floor. Q lives above M’s floor.
Number of persons living below R is equal to number of persons living above _______.
This questions was previously asked in
RRB Clerk Prelims (07 Aug, 2022 Shift 1)
Explanation:
- We have seven persons: M, N, O, P, Q, R, and S on seven floors.
- N lives two floors above R. So, N = R + 2.
- M doesn't live on a prime numbered floor (floors 2, 3, 5, and 7 are prime).
- Three persons live between R and P's floors, so if R is on floor 1, P is on floor 5 or vice versa.
- O lives just above S.
- P lives on a prime numbered floor.
- Q lives above M.
Given all this, we can determine:
- Place R on floor 2. Then, N will be on floor 4.
- P should be on a prime numbered floor and three floors away from R, so P is on floor 5.
- O is above S, we can place O on floor 7 and S on floor 6.
- Since Q is above M, we place Q on floor 3, leaving floor 1 for M.
The number of persons below R (floor 2) is 1, thus there should be 1 person above N (floor 4).
- Correct Answer: 3, N.
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By: Parvesh Mehta