In a certain town, 90% of the residents drink coffee, 80% drink tea, 70% drink whiskey, and 60% drink gin.
No one drinks all four.
What percent of the residents drink liquor?
They all do.
Under the stipulations of the problem,
there are at most 30% who do not drink both tea and coffee. If these 30% drink both whiskey and gin, then there can be no overlap between the remaining 40% of whiskey drinkers, and 30% of gin drinkers, implying that everyone enjoys at least one kind of tipple.
Edited on May 3, 2016, 7:50 am
Posted by broll
on 2016-05-03 07:47:15