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

Example Input: Problem: a number x is mistakenly divided by 10 instead of being multiplied by 10 . what is the percentage error in the result ?
Example Output: - 99 %

Example Input: Problem: . 005 / ? = . 01
Example Output: . 5

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

