If 23rd of December was Friday, what should be the day on 8th of January of the next year?
Since there are 7 days in a week , if 23rd is a Friday then 23 + 7 = 30 is also a Friday. And the last day of the year 31st December will be Saturday. That means 1st January of the next year is a Sunday. So 1 + 7 = 8th of January is also a Sunday.