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

Ex Input:
Problem: the average of first 5 multiples of 5 is

Ex Output:
1


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: if the simple interest on a certain sum of money for 6 years is one – fifth of the sum , then the rate of interest per annum is

Ex Output:

3.3 %