Counting backwards — Aptitude Question
Counting backwards: If today is Thursday, what day was it 45 days ago? Answer and worked solution on CodeKairo.
- Topic: Mathematical Reasoning
- Section: Logical Reasoning
- Difficulty: Medium
- Time target: 60 seconds
Question
If today is Thursday, what day was it 45 days ago?
Options
- Monday
- Tuesday
- Wednesday
- Friday
Show the answer and the worked solution
Correct answer: A. Monday
Worked solution
- 45 = 6 × 7 + 3, so there are 3 odd days.
- Counting back from Thursday: Wednesday (1), Tuesday (2), Monday (3).
- The day was Monday.
Answer: Monday.
The idea
Going backwards, subtract the odd days instead of adding them.
Shortcut. Seven weeks (49 days) ago was also a Thursday; 45 days ago is 4 days after that — Friday, Saturday, Sunday, Monday.
Common trap. "Tuesday" — finding 3 odd days but counting Thursday itself as the first step back (Thursday, Wednesday, Tuesday).