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

Example Input: Problem: two numbers are in the ratio of 7 : 6 . if 18 be subtracted from each , they are in the ratio of 6 : 5 . find the numbers ?
Example Output: 7,6

Example Input: Problem: a and b can do a piece of work in 7 days . with the help of c they finish the work in 5 days . c alone can do that piece of work in ?
Example Output: 30 days

Example Input: Problem: a train running at the speed of 40 km / hr crosses a pole in 9 seconds . what is the length of the train ?
Example Output:
100 meter