A total of 428 tickets sold for the school play. They were either adults tickets or student tickets. The number of students tickets sold was three times the number of adult tickets sold. How many adults tickets were sold.

107 Adult tickets were sold.

Total tickets sold = 428

428:4=107 (split into four equal groups)

107*3=321 (amount of student tickets sold) (this is 3/4 of the total amount sold)

107*1=107 (amount of adult tickets sold) (this is 1/4 of the total amount sold)

321+107=428 (amount of tickets sold total)

321 (amount of student tickets sold) is three times the number of adult tickets sold. (107) 107*3=321