Identify the problem that represents the join, result unknown structure
A) Maryann had 3 library books before she checked out 2 more. How many did she have all together?
B) Maryann had 5 library books before she returned 2 of them. How many does she have now?
C) Maryann had 4 nonfiction books and 2 fiction. How many more nonfiction books does she have?
D) Maryann had 9 library books and Jim had 4. How many more did Maryann have than Jim?
Ans: A) Maryann had 3 library books before she checked out 2 more. How many did she have all together?
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