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

Ex Input:
Problem: during a certain two - week period , 60 percent of the movies rented from a video store were comedies , and of the remaining movies rented , there were 3 times as many dramas as action movies . if no other movies were rented during that two - week period and there were a action movies rented , then how many comedies , in terms of a , were rented during that two - week period ?

Ex Output:
6 a


Ex Input:
Problem: how much interest will $ 10,000 earn in 9 months at an annual rate of 4 % ?

Ex Output:
$ 300


Ex Input:
Problem: 5 / 8 of 3 / 10 of a number is greater than 4 / 9 of 1 / 4 of the same number by 55 . what is half of that number ?

Ex Output:

36