At the pet store, there are 7 puppies and 6 kittens for sale. Two puppies and three kittens are sold. How many pets remain at the store?
There are 7 + 6 = <T>add(7, 6)=13 pets.
They sell 2 + 3 = <T>add(2, 3)=5 pets.
After the sales, there are 13 - 5 = <T>subtract(13, 5)=8 pets.
