Tickets sold between adults and students

Question

640 tickets sold. There were 60 fewer student tickets than adult ticket. How many adult tickets were sol? 

Answer 1

a = number of adult tickets

a - 60 = number of student tickets

a + (a - 60) = total number of tickets = 640 ⇒

 

2a - 60 = 640

 

a = (640 + 60)/2 = 700/2 = 350

a - 60 = 350 - 60 = 290

 

350 adult tickets were sold

290 student tickets were sold