Final answer:
After selling 100 puppies each, the first store will have 100 puppies left, and the second store will have 400 puppies left, making for a total of 500 remaining puppies. Dividing this total by 200 gives us 2.5.
Step-by-step explanation:
The question asks us to calculate the remaining number of puppies at two stores after they both sell some, and then to find out what this total is when divided by 200.
Initially, the first store has 200 puppies and the second store has 500 puppies. They both sell 100 dogs. So, the first store will have 200 - 100 = 100 puppies left, and the second store will have 500 - 100 = 400 puppies left after the sale.
When we combine the remaining puppies from both stores, we get 100 (from the first store) + 400 (from the second store) = 500 puppies in total. Now, to complete the final step of the question, we divide this total by 200, which equals 500 / 200 = 2.5.
Therefore, the answer to the student's question is 2.5.