December 2011
Problem of the Month

Birthday Problem

Many years ago, I made the following statement:

"Four days ago, I was only 34,
but next year I'll be 37."

When is my birthday?

Give all possibilities.

Solution to the Problem:

My birthday must fall on December 29, December 30, or December 31.

"Today" must be January 1, 2, or 3.

Then four days ago would be December 28, 29, or 30 of the previous year, when I was 34.

My birthday would be either December 29, December 30, or December 31 when I turned 35.

Then I would turn 36 on that day in the current year, and I would be 37 the next year.

Correctly solved by:

1. Bo Aimone	Mountain View High School, Mountain View, Wyoming
2. Alyssa Sibelrud	Mountain View High School, Mountain View, Wyoming
3. James Alarie	Flint, Michigan
4. Chad Fore	Gate City, Virginia
5. Masyra Wilkinson	Mountain View High School, Mountain View, Wyoming
6. bindlh@kpmath.com	Mountain View High School, Mountain View, Wyoming
7. Kaylor Dolezal	Mountain View High School, Mountain View, Wyoming
8. Hannah Black	Mountain View High School, Mountain View, Wyoming
9. Morgan Angwin	Mountain View High School, Mountain View, Wyoming
10. Hayden Meeks	Mountain View High School, Mountain View, Wyoming
11. Brandon Preston	Mountain View High School, Mountain View, Wyoming
12. Isaac kampman	Mountain View High School, Mountain View, Wyoming
13. Jenny Harant	Mountain View High School, Mountain View, Wyoming
14. Jt Gray	Mountain View High School, Mountain View, Wyoming
15. Alex Snyder	Mountain View High School, Mountain View, Wyoming
16. Newt Iorg	Mountain View High School, Mountain View, Wyoming
17. Caleb Flake	Mountain View High School, Mountain View, Wyoming
18. Shandyn Covolo	Mountain View High School, Mountain View, Wyoming
19. Josey Pitts	Mountain View High School, Mountain View, Wyoming
20. Trystin Walker	Mountain View High School, Mountain View, Wyoming
21. Lisa Merwin	Taylor, Michigan

Send any comments or questions to: David Pleacher