Question

if today is tuesday. what will it be after 5,637 days.?

Answer 1

You want to know how many weeks later that is, and then the remainder is the number of days after tuesday it will be in the week. So:
1. 5637 days / 7 days/week = 805 weeks with a remainder of 2 days.
2. 805 weeks later, it will still be Tuesday. 2 days after that it will be Thursday, which is the answer