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A puzzle and a Marcos trick Callau

feel again with this lightly, but, well, I liked (and, of course, I have not guessed), so to see who is the ready-to:

Before yesterday, Mary was 17 years next year will be 20 years, how can it be?

Edit:

And I add this trick Callau Marcos (graciassss):

Gather each of the last two digits of the year you were born (ie, if you were born in 1981, then 81) and age sumadlos you are going to meet this year (not the years that you have but those who are going to meet in 2011 .) The result will always be 111. Things of 2011.

Kisses and hugs.