In a survey of 290 newspaper readers 181 of them read the daily times, 142 read the guardian, 117 read punch and each reads at least one of the three papers. If 75 read the daily times and the guardian, 60 read the daily times and punch, and 54 read the guardian and punch
I don't mind helping to find answers, but I resent having to provide the questions as well.
think about inclusion-exclusion principle