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) 30 adult tickets; 25 student tickets E) 35 adult tickets; 20 student tickets