Let's get straight to the point; below is 100 Rooms 22 solutions in step by step written guide and video walkthrough demonstrating how it's done.
1. Based on the diagram shown, follow a counter-clockwise direction.
2. 24 (only digits 2 and 4 is divisible by 2 and gives us .0 at the end. So the hint is 100/2=50.0)
3. 4 (from four furnitures appearing below the numbered squares).
4. 12 - hours of day and night when they are equal as suggested in the picture.
5. 10 - number of birds you see.
6. 11 - total number of fish is 21 but if every bird eats 1 fish you only get eleven left.
Now here is
100 Rooms Level 22 walkthrough showing the above solution executed (PS. I found all these searching forums on the web, you just have to look harder).