Answer:
34,623 books
Explanation:
First, add the amount taken out in November to the amount from the first 10 months of the year.
427,113 + 38,264
= 465,377
Then, subtract this from 500,000:
500,000 - 465,377
= 34,623
So, to meet the librarian's goal, 34,623 books need to go out in December.