I'm assuming that "how much does each ticket cost?" probably isn't the correct question for this problem. They already told you that adults are $4 and kids are $2 It is probably "how many of each ticket were sold?"
Assuming this, you have to start by writing two equations from the information provided:
105 total tickets were sold
they made $360 and adult tickets cost $4 and kids tickets cost $2
lets solve for x in the first equation:
we can plug this into the second equation and solve for y
we can plug this into the first equation and solve for x:
I hope this helps. Let me know if you have further questions.