A line is 180 degrees so write x+(4x-20)=180
12!!!! Hope this helped and good encouragement
Answer:

Step-by-step explanation:
Total number of tickets sold = 3388
Total number of coach tickets = 3069
Total number of first-class tickets = Total number of tickets sold - Total number of coach tickets
= 3388 - 3069
= 319

Ratio of the number of first-class tickets to the total number of tickets = 319:3388