Jack Who?
Whether in primary or high school, these sorts of questions have always appeared throughout my life. Strangely, the individuals in charge of the math section for each year level felt that this kind of question was the most essential.
These questions are fantastic, but only if they make sense. Given that it is already confounding enough, this sort of question does not require anything else to add to the mix. Really, who is Jack, and what relevance does he have to the situation?