Answer :
Step-by-step explanation:
45/5 is 9 books in each carton
1st reader 9-3 is 6 books left
2nd reader 6-4 is 2 books left
the answer is 2 books left in the carton
2 books because 45 total books divided by the 5 crates is 9. Then the first reader took 3 books, and then the second reader took 4 books whch is 7 books in total. And 9-7 is 2.