7 people had the following conversation.
A: The day after tomorrow is Wednesday.
B: No, today is Wednesday.
C: Both of you are wrong, Wednesday is tomorrow.
D: Today is neither Monday, nor Tuesday, nor Wednesday.
E: I am pretty sure that Thursday was yesterday.
F: No, yesterday was Tuesday.
G: All I know, is yesterday wasn’t Saturday.
Only one of them is telling the truth. On which day did the argument took place?
Answer
They argued on a Sunday.
The table below summarises the event. ‘x’ indicate the possible days if that person’s statement is true. The only column with a single ‘x’ is on Sunday, therefore D is the only person who is correct.
| Day / Person | Mon | Tue | Wed | Thur | Fri | Sat | Sun |
|---|---|---|---|---|---|---|---|
| A | x | ||||||
| B | x | ||||||
| C | x | ||||||
| D | x | x | x | x | |||
| E | x | ||||||
| F | x | ||||||
| G | x | x | x | x | x | x |