Answer:
34,623
Explanation:
The first 10 months meaning January through October there was a total of 427,113 books checked out. On the eleventh month (November) there was a total of 38,264 books checked out. The librarian wants to set a record of 500,000 books so what is the difference?
500,000-427,113-38,264= 34,623
Therefore, on the twelve month (December) there must be a total of 34,623 books checked out in order to reach the goal of 500,000 books checked out.