3 birds and 4 storks were sitting on the fence. 6 more storks came to join them. How many birds and storks are sitting on the fence?
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There are 3 birds and 4 storks sitting on the fence. 

6 more storks came to join them. 

That means there are now 9 storks sitting on the fence. 

3 birds and 9 storks are sitting on the fence.