Part A: Jin sells 20 tickets to the students and sells 35 tickets to adults
My reasoning: well considering that there is 4 students and each student pays $5 for one ticket you would multiply 5 and 4 and get 20. And that there is 5 adults and that the cost to get in is $7 so 5 times 7 is 35
Part B: Jin received 15 more adult tickets than students tickets
My reasoning: well because 35-15 is 20