Anna is selling tickets to her tennis tournament. An adult ticket costs $20 and a student ticket costs $16. Anna collects $1020 for a total of 55 tickets.
How many adult and how many student tickets has Anna sold?
A) 20 adult tickets; 35 student tickets
B) 21 adult tickets; 34 student tickets
C) 25 adult tickets; 30 student tickets
D) 35 adult tickets; 20 student tickets