Question : Directions: If the 13th of December 1969 is Saturday, then what will be the day of the week on the 9th of July 1978?
Option 1: Saturday
Option 2: Friday
Option 3: Sunday
Option 4: Monday
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Correct Answer: Sunday
Solution :
Given:
13th of December 1969 is Saturday.
Let's calculate 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
Now, on dividing 3130 by 7, we get 447 as the quotient and 1 as the remainder.
Therefore, add 1 to Saturday, Saturday + 1 = Sunday
So, the 9th of July 1978 will be Sunday. Hence, the third option is correct.
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