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

Example Input: Problem: a = 5 ^ 10 - 625 ^ 2 and a / x is an integer , where x is a positive integer greater than 1 , such that it does not have a factor p such that 1 < p < x , then how many different values for x are possible ?
Example Output: two

Example Input: Problem: a train running at the speed of 72 km / hr crosses a pole in 9 seconds . find the length of the train .
Example Output: 180 meter

Example Input: Problem: in township k , 1 / 5 of the housing units are equipped with cable television . if 1 / 10 of the housing units , including 1 / 3 of those that are equipped with cable television , are equipped with videocassette recorders , what fraction of the housing units have neither cable television nor videocassette recorders ?
Example Output:
23 / 30