This maybe a typo skip to the next questions then come back to this one once your done if no one figured that out then ask a classmate or teacher I would say send an email to a teacher asking if this was a typo hopefully they respond
In your question where as the amount of gasoline that 80 drivers bought to fill their cars gas tanks is shown in your diagram and the problem as to find how many drivers bought more than 12 gallons and the best answer would be 36. I hope you are satistfied with my answer and if you need some clarification, please feel free to ask for more