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

Example Input: Problem: if the cost price of 50 articles is equal to the selling price of 40 articles , then the gain or loss percent is ?
Example Output: 25 %

Example Input: Problem: paul ' s income is 40 % less than rex ' s income , quentin ' s income is 20 % less than paul ' s income , and sam ' s income is 40 % less than paul ' s income . if rex gave 60 % of his income to sam and 40 % of his income to quentin , quentin ' s new income would be what fraction of sam ' s new income ?
Example Output: 11 / 12

Example Input: Problem: what is the lowest positive integer that is divisible by each of the integers 1 through 8 inclusive ?
Example Output:
840