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

Ex 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 ?

Ex Output:
45

Ex Input:
Problem: of the diplomats who attended a summit conference : 20 spoke japanese , 32 did not speak russian and 20 % of the diplomats spoke neither japanese nor russian . if 10 % of the diplomats spoke both japanese and russian , then how many diplomats attended the conference ?

Ex Output:
120

Ex Input:
Problem: john found that the average of 15 no . ' s is 40 . if 10 is added to each number then the mean of number is ?

Ex Output:
50