[Espy]

$25 --> $30 -$5

$10 each --> $30

30 - 3 = 27; hotel gets $25 + clerk's $2; the $3 was added to $25, not subtracted from $30. They each only had to pay $25 / 3 = $8.33

Uh...That was my thought process; not sure if it made sense.