Sets and Counting

Question

In a survey of 325 individual investors regarding subscriptions to the New York Times (NYT), Wall Street Journal (WSJ), and USA Today (UST), the following data were obtained.
124 subscribe to the NYT.
155 subscribe to the WSJ.
70 subscribe to the UST.
38 subscribe to the NYT and WSJ.
30 subscribe to the WSJ and UST.
22 subscribe to the NYT and UST.
56 do not subscribe to any of these newspapers.
(a) How many of the individual investors surveyed subscribe to all three newspapers?
      ?      investors

(b) How many subscribe to only one of these newspapers?
      ?       investors

Answer 1

See my answer to your other question.