If the ratio of cats to dogs is 3:5 and there are 15 cats, how many dogs are there?

In the given ratio of cats to dogs, 3:5 means that for every 3 cats, there are 5 dogs. Since you have 15 cats, you can set up a proportion. If 3 parts represent 15 cats, each part equals 5 (15 cats ÷ 3 parts). Now, to find the number of dogs, multiply the 5 parts by the value of each part: 5 parts × 5 = 25 dogs. So, there are 25 dogs! It's interesting to note that ratios like this are commonly used in various fields, such as in ecology to understand predator-prey relationships or even in marketing to analyze customer demographics. Knowing how to manipulate ratios can be both fun and useful in numerous real-world scenarios!