Skippy and Anna are locked in a room at the top of a large castle. There are five other locked rooms to go through to get out. The key to that room, and all the other rooms, is a number. The numbers are locked away in problems. The number is the key to that room. Can you help them to get out. When the solution to each room is posted in a comment the next problem will appear on the blog.
What do the hidden numbers on the bottom add to?
This number is the first key.