Question 1
6 people (Zoe, Hikari, Daniel, Leo, Susan, David) live on floors 1 to 6, one person per floor.
Based on these clues:
• Hikari lives immediately below Daniel
• Zoe lives on an even-numbered floor
• Leo's floor number is congruent to 2 modulo 3
• Daniel and Susan live on consecutive floors
• Hikari's floor number is congruent to 0 modulo 3
On which floor does Hikari live?
The unique arrangement (floor: person) is: {1: 'David', 2: 'Leo', 3: 'Hikari', 4: 'Daniel', 5: 'Susan', 6: 'Zoe'}.