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

Example Input: Problem: what least number must be subtracted from 13294 so that the remainder is exactly divisible by 97 ?
Example Output: 5

Example Input: Problem: 1370 , x , 1070 , - 180 , - 6430
Example Output: 1320

Example Input: Problem: a small water pump would take 3 hours to fill an empty tank . a larger pump would take 3 / 4 hour to fill the same tank . how many hours would it take both pumps , working at their respective constant rates , to fill the empty tank if they began pumping at the same time ?
Example Output:
3 / 5