Reasoning Ability - Calendar Problems
A person was born on 1st January 1985. If his 35th birthday was on Wednesday, what day was he born?
A person was born on 1st January 1985. If his 35th birthday was on Wednesday, what day was he born?
easy Q1 of 15
Step-by-Step Solution
Step 1: Determine years crossed
From 1 Jan 1985 → 1 Jan 2020 = 35 completed years.Step 2: Count leap years
Leap years among 1985–2019: 1988, 1992, 1996, 2000, 2004, 2008, 2012, 2016 → 8 leaps.Step 3: Compute odd days
Ordinary years = 35 − 8 = 27 → 27×1 = 27. Leap years = 8 → 8×2 = 16. Total = 27 + 16 = 43 → 43 mod 7 = 1 odd day.Step 4: Back-calculate birth weekday
35th birthday = Wednesday. Birth weekday = Wednesday − 1 = Tuesday.Final Answer:
Tuesday → Option BQuick Check:
Tuesday + 1 odd day = Wednesday ✅
Quick Trick: Count completed years, include starting year if within the completed span for leap count; subtract remainder from given birthday.
Common Mistakes:
MISTAKES- Including the birthday year among completed years or miscounting leap years.
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