(1) Q lives on top floor, in an odd numbered flat.
(Q stays in either flat 1 or flat 3)
(2) T lives in flat number 3, on 3rd floor.
Case 1:
Floor
|
Flat 1
|
Flat 2
|
Flat 3
|
4
|
Q
|
|
|
3
|
|
|
T
|
2
|
|
|
|
1
|
|
|
|
Case 2:
Floor
|
Flat 1
|
Flat 2
|
Flat 3
|
4
|
|
|
Q
|
3
|
|
|
T
|
2
|
|
|
|
1
|
|
|
|
(3) Only two floors are there between A and D who lives in an even numbered flat.
(4) B and D stay in the same numbered flat and on an odd numbered floor.
Since B and D stays on odd floor, So A stays on top floor and D stays on floor 1.
Case 1:
Floor
|
Flat 1
|
Flat 2
|
Flat 3
|
4
|
Q
|
|
|
3
|
|
B
|
T
|
2
|
|
|
|
1
|
|
D
|
|
Case 2:
Floor
|
Flat 1
|
Flat 2
|
Flat 3
|
4
|
|
|
Q
|
3
|
|
B
|
T
|
2
|
|
|
|
1
|
|
D
|
|
(5) U lives on a floor immediately above W.
(6) Neither U nor W lives on the same floor on which T lives.
(7) U does not live in an odd numbered flat.
Therefore, W lives on floor 1.
Case 1:
Floor
|
Flat 1
|
Flat 2
|
Flat 3
|
4
|
Q
|
|
|
3
|
|
B
|
T
|
2
|
|
U
|
|
1
|
|
D
|
|
Case 2:
Floor
|
Flat 1
|
Flat 2
|
Flat 3
|
4
|
|
|
Q
|
3
|
|
B
|
T
|
2
|
|
U
|
|
1
|
|
D
|
|
(8) Only one floor is there between V and Q.
V lives on floor 2.
(9) C lives immediate below the flat of S who is living on even floor.
(10) C lives in the same numbered flat as A.
Case 1:
Floor
|
Flat 1
|
Flat 2
|
Flat 3
|
4
|
Q
|
|
A
|
3
|
|
B
|
T
|
2
|
V
|
U
|
S
|
1
|
|
D
|
C
|
Case 2:
Floor
|
Flat 1
|
Flat 2
|
Flat 3
|
4
|
A
|
|
Q
|
3
|
|
B
|
T
|
2
|
S
|
U
|
V
|
1
|
C
|
D
|
|
(11) R and S live in the same numbered flat.
W lives on floor 1 (refer point 7)
Thus, case 1 eliminates.
Case 2:
Floor
|
Flat 1
|
Flat 2
|
Flat 3
|
4
|
A
|
P
|
Q
|
3
|
R
|
B
|
T
|
2
|
S
|
U
|
V
|
1
|
C
|
D
|
W
|
Thus, P and Q stay above B.