There are 20 cats and dogs, 4 more dogs than cats. How many cats and dogs are there? We also know about the math problem in the first grade of primary school, cat 8 dogs 12, why not tell the baby?
Only 8 cats were taken out of 20, 20-4-4 = 12, and the remaining 12 dogs and cats.
There are four more dogs than cats. Take out eight. 4+8 = 12, so the rest 12 are all dogs.
20- 12 =8
So there are 8 cats, 12 dogs.