In a survey of 150 individuals, it is found that 50 own dogs, 40 own cats, and 25 own birds. There are individuals who own both dogs and cats, and there are 15 individuals who own birds but not cats. There are 10 individuals who own birds and cats. Draw a suitable Venn Diagram. How many of the individuals own only cats? What is the probability that a randomly chosen individual owns a cat but not a bird?