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

Example Input: Problem: a cistern is normally filled in 6 hours but takes two hours longer to fill because of a leak in its bottom . if the cistern is full , the leak will empty it in ?
Example Output: 24

Example Input: Problem: the smallest value of n , for which n + 2 is not a prime number , is
Example Output: 2,4

Example Input: Problem: given f ( x ) = 3 x – 5 , for what value of x does 2 * [ f ( x ) ] + 8 = f ( 3 x – 6 )
Example Output:
7