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

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

Example Input: Problem: the mean daily profit made by a shopkeeper in a month of 30 days was rs . 350 . if the mean profit for the first fifteen days was rs . 255 , then the mean profit for the last 15 days would be
Example Output: rs . 445

Example Input: Problem: the speed of a boat in still water is 60 kmph and the speed of the current is 17 kmph . find the speed downstream and upstream ?
Example Output:
77,43 kmph