Interview Q&A / Aptitude

1. Which is the next year after 2025 that will have exactly the same calendar as 2025?

   2031. Two years share a calendar when they start on the same weekday and are both leap or both non-leap. Adding odd days from 2025 onward (1, 1, 1, 2, 1, 1) reaches 7 after 2030, so 2031 starts on the same day as 2025 (Wednesday) and is also a non-leap year.

   IntermediateQuick answer1 min read
2. What day of the week was 15 August 1947?

   Friday. Count odd days (days beyond complete weeks): 1,900 years give 1 odd day, 1901 to 1946 give 46 + 11 leap days = 57, which is 1, and 1 January to 15 August 1947 gives 227 days, which is 3. Total 5 odd days, and 5 corresponds to Friday.

   AdvancedQuick answer1 min read