If 15th January, 2020 was a Wednesday, then what day of the week was it on 31st December of that year?

Thursday

The correct answer is Option (2) → Thursday

• Given: 15th January 2020 = Wednesday

• Find: Day on 31st December 2020

• 2020 is a leap year

Let’s count the number of days from 15 Jan to 31 Dec 2020.

We know:

• Total days in a year = 366 (leap year)

• Days till 15 Jan = 15

• So, days from 15 Jan to 31 Dec = 366 − 15 = 351

Now, let's find the number of odd days by dividing the total number of days by 7: 351 ÷ 7 = 50 weeks with a remainder of 1.

So the day advances by 1 days from Wednesday: Wednesday + 1 day = Thursday