Reasoning Ability - Calendar Problems
A person was born on 5th June 1995. If his 25th birthday fell on a Friday, what day of the week was he born?
A person was born on 5th June 1995. If his 25th birthday fell on a Friday, what day of the week was he born?
easy Q11 of 15
Step-by-Step Solution
Step 1: Calculate years crossed
From 5 Jun 1995 → 5 Jun 2020 = 25 years.Step 2: Count leap years
Leap years between 1996 and 2019: 1996, 2000, 2004, 2008, 2012, 2016 → 6 leap years.Step 3: Compute odd days
Ordinary = 19 × 1 = 19; Leap = 6 × 2 = 12; Total = 31 → 31 mod 7 = 3 odd days.Step 4: Back-calculate birth weekday
25th birthday = Friday. Birth weekday = Friday − 3 = Tuesday.Final Answer:
Tuesday → Option CQuick Check:
Tuesday + 3 odd days = Friday ✅
Quick Trick: Count leap years in the completed years, compute odd days, then shift backward from the known birthday.
Common Mistakes:
MISTAKES- Including the birthday year (2020) when counting completed leap years.
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