What should you do if a person is unconscious and not breathing?

You should call an ambulance, and while you are waiting for the ambulance try to perform C.P.R. on that certain person.

Check pulse , tap on shoulders check for any response , if no pulse start cpr

1 person = 30 compressions 2 breaths
2 people = 15 compressions 2 breaths

The best way is to swollow and hold in your breath

Ithink the answer is talking about their problems