Well, let's see how many dogs, cats, and snakes are there in the last question...there's 7 dogs, 4 cats, and 1 snake. There's a total of 20 pets...including the rabbit and etc.
7 ÷ 20 = 0.35
4 ÷ 20 = 0.20
1 ÷ 20 = 0.05
Question 3
A) A dog has a probability of 0.35%
B) A snake has a probability of 0.05%
C) A cat has a probability of 0.20%
Question 4
A) There are 7 dogs and 4 cats, so in total there's 11 pets.
B) If we add all the pets together, we get a total of 20 pets.
C) If we're including all the pets then the perctange would stay the same, a dog would have a 0.35% of being adopted, whereas a cat has a 0.20% of being adopted.
I hope this helps!
(But, if the question is asking which has a higher chance of being adopted between a cat and a dog, then the dog would win...between the dogs and cats there's a total of 11)
7 ÷ 11 = 0.63%
4 ÷ 11 = 0.36%