Answer:
300 adults, 200 students
Explanation:
1) Let the number of adult tickets sold be
, so the number of student tickets sold is

2) Adult tickets are $20 each so the amount of money made from these

3) Student tickets are $5 each so the amount of money made from these
4) Because $7000 was made in total, we have

5) Solving this, we obtain

6) So the number of adults was
, and the number of students was
