The problem looks like this:

Stephen asked 100 coffee drinkers whether they like cream or sugar in their coffee. According to the Venn diagram below, how many like:

a) Cream?

b) Sugar?

c) Sugar but not cream?

d) Cream but not sugar?

e) Cream and sugar?

f) Cream or sugar?

g) Black (no cream, no sugar)?

Also, the Venn Diagram picture is attached. In the "Cream" section of the Venn diagram, it states that there are 16 coffee drinkers who like cream. There are 35 for sugar, and in the overlap area there are 20.

How do I solve these problems? Am I over-thinking it?