If 85% of people have a bowl of cereal for breakfast, 60% of people have some toast for breakfast, and 50% of people have both cereal and toast for breakfast, what proportion of people have neither cereal nor toast for breakfast?
The only problem is, I've never done stats in my life :|... I can do pure math, applied math etc very well, but the last time i done stats was about 5 years ago so im sort of learning everything by scratch to be able to tackle these questions
If 50% are having both cereal and toast it means that of the 85% eating cereal only 35% are eating just that.
Same goes for the toast, of the 60% eating toast only 10% are eating just that leaving 55% eating neither.