Reasoning Ability - Calendar Problems
A woman celebrated her 40th birthday on a Friday in 2020. What day was she born?
A woman celebrated her 40th birthday on a Friday in 2020. What day was she born?
easy Q2 of 15
Step-by-Step Solution
Step 1: Find birth year
2020 − 40 = 1980.Step 2: Years crossed and leap count
Completed years 1980–2019 → 40 years. Leap years: 1980, 1984, 1988, 1992, 1996, 2000, 2004, 2008, 2012, 2016 → 10 leaps.Step 3: Compute odd days
Ordinary = 30×1 = 30; Leap = 10×2 = 20; Total = 50 → 50 mod 7 = 1 odd day.Step 4: Back-calculate birth weekday
40th birthday = Friday. Birth weekday = Friday − 1 = Thursday.Final Answer:
Thursday → Option AQuick Check:
Thursday + 1 = Friday ✅
Quick Trick: For 40 years the remainder is often 1 — verify by counting leaps precisely.
Common Mistakes:
MISTAKES- Omitting the starting leap year when it is a leap (1980 here).
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