Ten persons A, B, C, D, E, F, G, H, I and J live in a building that consists of five floors. The bottommost floor is numbered as 1, the floor above it as 2 and so on. Each floor consist of two flats- Flat P and Flat Q. Flat P of each floor is towards the west of Flat Q.
Four persons live between D and G.
D lives neither on even-numbered floor nor in flat Q.
| Case 1 | | Case 1a | | Case 2 | | Case 2a | |
| Floor 5 | | | | | D | | D | |
| Floor 4 | G | | | G | | | | |
| Floor 3 | | | | | | | | |
| Floor 2 | | | | | G | | | G |
| Floor 1 | D | | D | | | | | |
| Flat P | Flat Q | Flat P | Flat Q | Flat P | Flat Q | Flat P | Flat Q |
A lives to the east of J. C lives immediate above A but neither in the same flat nor with G.
H lives on floor 3.
Thus, case 2 and case 2a are invalid.
| Case 1 | | Case 1a | |
| Floor 5 | | | | |
| Floor 4 | G | | | G |
| Floor 3 | C | H | C | H |
| Floor 2 | J | A | J | A |
| Floor 1 | D | | D | |
| Flat P | Flat Q | Flat P | Flat Q |
Neither F nor I lives towards east of G. G lives below F.
F and I lives on the adjacent floors. Thus, case 1 is invalid.
| Case 1a | | Case 1a.a | |
| Floor 5 | F | | | F |
| Floor 4 | I | G | I | G |
| Floor 3 | C | H | C | H |
| Floor 2 | J | A | J | A |
| Floor 1 | D | | D | |
| Flat P | Flat Q | Flat P | Flat Q |
B lives above E in the same flat. Thus, case 2a.a is invalid.
Therefore, the final arrangement is:
| Floor 5 | F | B |
| Floor 4 | I | G |
| Floor 3 | C | H |
| Floor 2 | J | A |
| Floor 1 | D | E |
| Flat P | Flat Q |
I and G live on the floor immediately above C's floor.
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