Reasoning Ability - Calendar Problems
A person was born on 15th April 1992. If his 32nd birthday was a Sunday, what day was his birth?
A person was born on 15th April 1992. If his 32nd birthday was a Sunday, what day was his birth?
medium Q7 of 15
Step-by-Step Solution
Step 1: Determine span
1992 → 2024 = 32 completed years (15 Apr 1992 → 15 Apr 2024).Step 2: Count leap years
Leap years in 1992–2023: 1992, 1996, 2000, 2004, 2008, 2012, 2016, 2020 → 8 leaps.Step 3: Compute odd days
Ordinary = 24×1 = 24; Leap = 8×2 = 16; Total = 40 → 40 mod 7 = 5 odd days.Step 4: Back-calculate birth weekday
32nd birthday = Sunday. Birth weekday = Sunday − 5 = Tuesday.Final Answer:
Tuesday → Option AQuick Check:
Tuesday + 5 = Sunday ✅
Quick Trick: Use mod 7 early to simplify large totals.
Common Mistakes:
MISTAKES- Not including the starting leap year when it falls within the completed span.
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