Let’s add up the numbers we have so far in this circle: So 16 people are left over to go in the section that is blank. We can now fill this in on our Venn diagram. 16 visitors had seen Band X ...

Let’s add up the numbers we have so far in this circle: So 16 people are left over to go in the section that is blank. We can now fill this in on our Venn diagram. 16 visitors had seen Band X ...