Reasoning Ability - Calendar Problems
How many odd days are there in 200 years?
How many odd days are there in 200 years?
easy Q11 of 15
Step-by-Step Solution
Step 1: Break into two 100-year blocks
Each 100 years = 5 odd days.Step 2: Add both blocks
200 years = 5 + 5 = 10 odd days.Step 3: Reduce modulo 7
10 ÷ 7 → remainder = 3 → 3 odd days.Final Answer:
3 odd days → Option AQuick Check:
200 years ≡ 3 (mod 7) ✅
Quick Trick: Each century contributes 5 odd days; add and reduce mod 7.
Common Mistakes:
MISTAKES- Saying 10 odd days without reducing modulo 7.
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