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

Example Input: Problem: if | 5 x - 20 | = 100 , then find the sum of the values of x ?
Example Output: 8

Example Input: Problem: two cubes have their volumes are in the ratio 1 : 27 . find the ratio of their surface area ?
Example Output: 1 : 9', 'd ) 2 : 7', 'e ) 3 : 11'

Example Input: Problem: fred and sam are standing 55 miles apart and they start walking in a straight line toward each other at the same time . if fred walks at a constant speed of 6 miles per hour and sam walks at a constant speed of 5 miles per hour , how many miles has sam walked when they meet ?
Example Output:
25