chest compressions are done in one set. Blank 2 sets of chest compressions and rescue breaths should be achieved over a duration of two minutes. Blank 3 sets of chest compressions and rescue breaths should be achieved over a duration of two minutes Blank 4 compressions per minute is the required rate of chest compressions when providing CPR. Blank 5 compression-to-ventilation is the required ratio for all casualties, regardless of age. Chest compressions should be Blank 6 of the casualty's chest depth