Question 6
A store sells special Pokémon stickers and each special Pokémon sticker is put into a special pack. This store also recycles these special packs. Anyone who returns 7 special packs can get one new special Pokémon sticker, which is also put inside a special pack. Chris has purchased 225 special Pokémon stickers from this store. What is the maximum number of extra special Pokémon stickers Chris can get from this store by returning special packs?