Baffling Birthdays

Strategies and Hints

It was a New Years Party. The year does not make a difference, but let's assume it is January 1, 1991. Suzanne's birthday is December 31. Two days ago was December 30, 1990, when Suzanne was 13. On December 31, 1990, she was 14. On December 31, 1991, she will be 15, and on December 31, 1992, she will be 16.