This is a common question type and I am constantly struggling with it. Some of these question I can answer easily when you can use a table to visualize the dependencies of the different sets (see OG13 p.144 for an example). But then there questions of the same type where a table cannot be used.OG13, p.177, no. 178:
Of the 300 subjects who participated in an experiment [...], 40 percent experience sweaty palms, 30 percent experienced vomiting, and 75 percent experienced dizziness. If all of the subjects experienced at least one of these effects and 35 percent of the subjects experienced exactly two of these effects, how many of the subjects experienced only one of these effects?
Are there any general pointers or solutions how to tackle just questions?[/i]
