4 birds and 17 storks were sitting on the fence. 28 more storks came to join them. How many birds and storks are sitting on the fence?
There are 4 birds and 17 storks sitting on the fence. 

28 more storks came to join them. 

This means that there are now 45 storks sitting on the fence. 

Since there are 4 birds and 45 storks, the total number of birds and storks sitting on the fence is 49.