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

Example Input: Problem: the set s consists of 5 numbers : { 1 , 2,3 , 4,5 } . if all possible subsets including the null set are created and one subset is chosen at random , what is the probability that the subset has 3 or 4 as its largest number ?
Example Output: 3 / 8

Example Input: Problem: if | x - 9 | = 3 x , then x = ?
Example Output: - 4.

Example Input: Problem: the price of 3 pants and 6 t - shirts is rs . 750 . with the same money one can buy 1 pant and 12 t - shirts . if one wants to buy 8 t - shirts , how much shall she have to pay ?
Example Output:
400