Quantitative Aptitude :: Calender Problems And Answers

10. What was the day of the week on 21st September, 1987?

A. Monday B. Saturday
C. Friday D. Wednesday
Answer & Explanation

Answer: Option A

Explanation:
What was the day of the week on 21st September, 1987?
21st September, 1987 = (1986 years + Period from 1.1.1987 to 21.9.1987)
Odd days in 1600 years = 0
Odd days in 300 years = (5 x 3) = 1
86 years has 21 leap years + 65 ordinary years.
Number of odd days in 86 years ( 21 x 2 + 65) = 107 = 2 odd days.
Jan.  Feb.   March    April    May      June  July    Aug   Sep 
(31 +  28  +  31   +   30   +   31   +   30   +  31  +  31  + 21) = 264 days
 168 days = 37 weeks = 5 odd day.
Total number of odd days = (0 + 1 + 2 + 5) = 8.   8/7 = 1 odd day
Given day is Monday.


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