He has given out 120 tickets because 15 x 8 = <<15*8=120>>120
He has 16 days left to had out tickets because 31 - 15 = <<31-15=16>>16
He has to give out 80 more because 200 - 120 = <<200-120=80>>80
He has to give out 5 a day because 80 / 16 = <<80/16=5>>5
#### 5