A group of women is asked to compare three cities, and the following information has been gathered:

43 like San Francisco

52 like Boise

47 like Houston

15 like San Francisco and Boise

18 like San Francisco and Houston

17 like Boise and Houston

10 like all three cities

6 like none of these cities

Use the above information to answer the following questions.

(a) How many women like San Francisco only?

(b) How many women like exactly two cities?

(c) How many women like at least two cities?