If 13 December 1969 is Saturday, then what will be the day of the week on 9 July 1978?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. Sunday.
Given: 13th of December 1969 is Saturday.
The total number of days from the 13th of December 1969 to the 9th of July 1978
Remaining days of 1969 = 18
Number of days from 1 January 1970 to 31 December 1977 = (8 × 365) + 2 = 2922 (2 leap years)
Number of days from 1 January 1978 to 9 July 1978 = 31 + 28 + 31 + 30 + 31 + 30 + 9 = 190
So, the total number of days from 13 December 1969 to 9 July 1978 = 18 + 2922 + 190 = 3130 ÷ 7 = 1 (odd day)
Therefore, 9 July 1978 = Saturday + 1 = Sunday