Quantitative Aptitude :: Calendar - Discussion

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Explanation:
Up to 1600 AD we have 0 odd days, up to 1900 AD we have 1 odd day. Now for in 47 years we have 11 leap years and 36 normal years.
Odd days from 1901 to 1947 = 11 x 2 +36 x1 = 22 + 36 = 58 odd days = 8 weeks + 2 odd days
Total odd days up to 31st December 1947 = 1 + 2 = 3 odd days
30 days of January contain only 4 weeks + 2 odd days
So 30th January 1948 has total 5 odd days
Day on 30th January 1948 = Friday.