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

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

Ex Output:
8


Ex Input:
Problem: how many positive integers less than 20 can be expressed as the sum of a positive multiple of 2 and a positive multiple of 3 ?

Ex Output:
14


Ex Input:
Problem: if a drawing has an outer circle of diameter 30 and an inner circle of diameter 24 , then what fraction of outer circle ' s surface is not covered by the inner circle ?

Ex Output:

9 / 25', 'e ) 2 / 3'