6 dogs are black, 5 dogs are white, and the rest are blue. If there are 15 dogs in total, how many are blue?

4 blue dogs

Step-by-step explanation:

Since there are 6 black dogs and 5 white dogs, there is 11 black and white dogs. There is 15 dogs in total, so you subtract 11 from 15, and that is 4. So, 4 dogs are blue.