Final answer:
To find the number of cats in the humane society, set up a proportion using the given ratio. Solve for 'c' using cross-multiplication and division. Substitute the value of 't' and calculate 'c' to find the number of cats.
Step-by-step explanation:
To find the number of cats in the humane society, we need to set up a proportion using the ratio of cats to all animals given in the question.
Let's denote the number of cats as 'c' and the total number of animals as 't'. The ratio of cats to all animals is 7 : 15. This can be written as:
c / t = 7 / 15
To solve for 'c', we can cross-multiply and then divide:
c = (7 / 15) * t
Substituting the value of 't' as 300 (the total number of animals):
c = (7 / 15) * 300
c ≈ 140
Therefore, there are approximately 140 cats in the humane society.