Answer: 60 tickets
Explanation:
To break even we have to find the point which these points cross:
y = 15x + 300
y = 20x
you can make the y's equal each other so
15x + 300 = 20x we can subtract 15x on both sides to isolate x
300 = 5x now divide by 5 on both sides
60 = x, so 60 tickets are needed to break even