A certain Dessert store conducts a customer survey to determine the preferences of its customers for the
Drinks. Customers are asked what type of Drinks they like. They may choose from Coffee, Vanilla, or
Choco, and none of the above (N). Of 100 customers some of the results are as follows: 55 like Coffee, 20
like all three, 15 likes Vanilla and Coffee but not Choco, 10 like Coffee and Choco, but not vanilla. How
many likes Coffee only?
