Reasoning Ability - Calendar Problems
A woman celebrated her 33rd birthday on Friday in 2021. What day of the week was she born?
A woman celebrated her 33rd birthday on Friday in 2021. What day of the week was she born?
hard Q9 of 15
Step-by-Step Solution
Step 1: Find birth year
2021 − 33 = 1988.Step 2: Count leap years
Completed years 1988–2020: leap years 1988, 1992, 1996, 2000, 2004, 2008, 2012, 2016, 2020 → 9 leaps.Step 3: Compute odd days
Ordinary = 24×1 = 24; Leap = 9×2 = 18; Total = 42 → 42 mod 7 = 0 odd days.Step 4: Back-calculate birth weekday
33rd birthday = Friday. Birth weekday = Friday − 0 = Friday.Final Answer:
Friday → Option CQuick Check:
0 remainder → same weekday ✅
Quick Trick: Remainder 0 means the weekday remains unchanged.
Common Mistakes:
MISTAKES- Shifting when the modular remainder is zero.
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