Adult tickets to the fall play cost $8 and student tickets cost $4. The drama class sold 20 more adult tickets than student tickets to the fall play. If the class collected $880 from ticket sales, how many student tickets were sold?
Let s be the number of student tickets sold.
The number of adult tickets sold is s+20.
The total income from adult tickets is $8*(s+20).
The total income from student tickets is $4s.
The total income from ticket sales is $880.
Thus, $8*(s+20)+$4s=$880.
Combining like terms, we get $8s+$160+$4s=$880
Combining like terms again, we get $12s+$160=$880
Adding -160 to both sides, we get $12s=$720.
Dividing both sides by $12, we get s=<<60=60>>60. Answer: \boxed{60}.