The total is 142.80, and taxes are 6.80. There are 4 tickets, and they want to know how much each ticket costs before taxes are added.
So, subtract the tax from the total:
142.80-6.80=136.00
Now, this is the cost of 4 tickets without tax. Divide it by 4 to get the amount of each ticket:
136/4=34
So each ticket costs $34 before tax.