Question

Please Help. Please help. I Give Medals.

On what day of the week will be my 100th birthday?I am 53 years old and was born on 7 May.

Explain how one can calculate the day of the week for any date. Of course you can Google the calculator, no problem. But you have to explain how it works to calculate a day in the future as well as a day in the past. Make up your own scenario for a "backwards" question.

Answer 1

1. born on May 7
2. in 2013, you are 53
3. 100 years from birth means \((100-53)= 47\) years from 2013
4. May 7 in 2013 was a TUESDAY.
5. Number of days from 2013 to 2060:
47*(365) + number of leap years

Answer 2

6. divide the number of days by "7" (since there are 7 days in a week).
7. the remainder gives you the offset of the day from Tuesday.

Answer 3

But you have to explain how your model works to calculate a day in the future as well as a day in the past. and your own work should work for a "backwards" question.

Answer 4

instead of adding, subtract. same deal.