Karl, Ryan, and Ben are fond of collecting stickers. Karl has 25 stickers. Ryan has 20 more stickers than Karl. Ben has 10 fewer stickers than Ryan. They placed all their stickers in one sticker book. How many stickers did they place altogether? Let's think first. Chain of thought:
Ryan has 25 + 20 = 45 stickers. Ben has 45 - 10 = 35 stickers. Therefore, there are a total of 25 + 45 + 35 = 105 stickers placed all together in a sticker book.
Therefore, the answer is 105.