Rachel picked 13 apples from her tree. If the tree had 49 apples initially. How many apples are still there on the tree?
1. Rachel picked 13 apples from her tree. 
2. If the tree had 49 apples initially, 
3. How many apples are still there on the tree? 

We are looking for the number of apples that are left on the tree. This is the same as saying, "How many apples does Rachel have?" We know that Rachel has 13 apples, and we know that the tree had 49 apples initially. So, if we subtract 13 apples from 49 apples, we will be left with the number of apples that are still on the tree. 

49 apples - 13 apples = 

36 apples