According to my books it is 60 life jackets.
The question stated it was 80 miles - so no rafts are needed and the 10% extra is for O2 masks.
It makes sense really, you depart the aircraft with your LJ on and don't inflate until outside the aircraft. If it is dodgy, when you are splashing around in the oggin, are you really going to swim back inside and get one of the 10% extra?
If it was 60 including the crew then you need 60 life jackets and 3 life rafts but the answers were 60, 0, none if there is life rafts or 66
What is the thought process behind that? Single engine is 30 mins or 100nm, multi is 120 mins or 400 miles. The question made no reference ot speed as far as I can recall.