Venn Diagrams and Sets 04

Now try this on your own! In a survey, 53 American tourists were asked, if they have visited the following Latin American countries: Argentina, Brazil, and Columbia. The following facts were gathered. 35 tourists have visited Argentina. 33 tourists have visited Brazil. 19 tourists have visited Columbia. 12 tourists have visited Argentina and Brazil, but not Columbia. 5 tourists have visited Argentina and Columbia, but not Brazil. 10 tourists have visited Argentina, Brazil and Columbia. Everyone who visited Columbia also visited at least one of the following two countries: Argentina, and Brazil. a. How many American tourists visited Argentina, but not Brazil or Columbia? b. How many American tourists visited Brazil, but not Argentina or Columbia? c. How many American tourists visited Brazil and Columbia, but not Argentina? d. How many American tourists visited none of the following three countries: Argentina, Brazil, and Columbia? Ans: a.8, b. 7, c. 4, d. 7