2. There is a group of 85 teachers. 40 of them have CPR training, 33 have fitness training and 42 have water safety training. 15 have CPR and fitness training, 12 have CPR and water training, 10 have fitness training and water safety training and 5 have all three types of training.

a) Make a three circle Venn diagram to illustrate these results.

b) How many teachers have exactly one of these training qualifications?