Sebastian bought three tires and paid $237.50 in total, including a fourth tire for just $5.
First, we subtract the cost of the fourth tire:
$237.50 - $5 = $232.50.
Next, we divide the cost of the first three tires by 3:
$232.50 ÷ 3 = $77.50.
So, each of the first three tires costs $77.50.