Álgebra and reasoning

Question

the Admisision ticket cost is $10 each student and $15 for each chaperone. 3 students are assigned to each chaperone. There is also a one time team registration fee of $20. The total cost for this activity is $200. Write an equation to determine x, the number of students who attend the activity. Then solve the equation you wrote to justify each step in the process

Answer 1

Three students and a chaperon cost $45.

200 = 20 + 45x

180 = 45x

4 = x

Four groups of three students is how many students?