Christmas 2004 was over and three teenagers were looking forward to their birthdays. Eric's was in February and Lisa's and Tammy's in January. Tammy is 8 weeks older than Eric, but 3 days younger than Lisa. What year were the girls born in?
The clues are
They are teenagers in 2004 (13, 14, 15, 16, 17, 18 or 19),
Eric was born on February 29 (the only way to make the age difference work with birthdays in January and February).
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