You may be asked to solve problems using Venn ... diagram. If we now look at Band Y circle, we have all the sections bar one. Now add up the numbers we have so far in Band Y circle: 20 + 11 + 3 ...

You may be asked to solve problems using Venn diagrams ... Y circle, we have all the sections complete except one. Now add up the numbers we have so far in Band Y circle: 20 + 11 + 3 = 34.