26 storks and 13 birds were sitting on the fence. 30 more birds came to join them. How many more birds than storks are sitting on the fence?
There are 26 storks and 13 birds sitting on the fence. 
30 more birds come to join them. 
Now there are a total of 56 birds sitting on the fence. 
There are 56-26 = 30 more birds than storks sitting on the fence.