The task is to generate the correct answer for a given math problem.

Example Input: Problem: a particular library has 75 books in a special collection , all of which were in the library at the beginning of the month . these book are occasionally loaned out through an inter - library program . if , by the end of the month , 80 percent of books that were loaned out are returned and there are 66 books in the special collection at that time , how many books of the special collection were loaned out during that month ?
Example Output: 45

Example Input: Problem: a cistern is normally filled in 6 hours but takes two hours longer to fill because of a leak in its bottom . if the cistern is full , the leak will empty it in ?
Example Output: 24

Example Input: Problem: stacy has a 63 page history paper due in 7 days . how many pages per day would she have to write to finish on time ?
Example Output:
9