If you would like to know the unit rate for $420 for 15 tickets, you can calculate this using the following steps:
$420 ... 15 tickets
$x = ? ... 1 ticket
420 * 1 = 15 * x
420 = 15 * x
x = 420 / 15
x = $28
The correct result would be: 1 ticket for $28.
