Question

an animal sanctuary houses a variety of animals. to understand the workload of the sanctuarys veterinarians, the director looked at which types of anim were treated or not treated by various doctors. the venn diagram shows this information for two of the doctors.
(a) how many types of animals were not treated by dr. lewis?
types of animals
(b) how many types of animals were treated by dr. lewis or dr. barnes (or both)?
types of animals
(c) which types of animals were treated by neither dr. lewis nor dr. barnes? choose all that apply.
birds dogs goats llamas mice
otters pigs quails rabbits snakes

Explanation:

Step1: Identify non - Dr. Lewis animals

Animals outside the "Treated by Dr. Lewis" circle are not treated by him. These are Mice, Llamas, Pigs, Rabbits, Otters, Goats. Count them.
There are 6 types.

Step2: Find animals treated by Dr. Lewis or Dr. Barnes

Animals in either the "Treated by Dr. Lewis" circle or the "Treated by Dr. Barnes" circle or both. These are Birds, Dogs, Snakes, Quails, Mice, Llamas, Pigs. Count them.
There are 7 types.

Step3: Determine animals treated by neither

Animals outside both circles are Goats, Otters, Rabbits.

Answer:

(a) 6
(b) 7
(c) Goats, Otters, Rabbits