Tom and Jerry have one day to work, but two tasks to focus on: building chairs and tables. If Tom spends all day building chairs, he will make 16 chairs. If he instead devotes his day to building tables, Tom will make 4 tables. If Jerry spends his day building chairs, he will make 14 chairs; if he spends the day building tables, he will make 7 tables. If Tom divides his time evenly between activities and acts efficiently, he will produce _____.