Problema Solution
Jacob asked John: "How old are you?" John said: "2 days ago I was still 16 years old. Next year I will turn 19." What is John's birthday, and what day of the year did Jacob ask him this question?
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Johns b-day is on 31 of December.
Jacob asked him on 1 of January.
Indeed 2 days before 1 of January (30 of December) John was 16.
John turned 17 on 31 of December
in the year when the question was asked he will turn 18
and the year after that he will turn 19.