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

Example Input: Problem: set s contains exactly 10 numbers and has an average ( arithmetic mean ) of 6.2 . if one of the numbers in set s is increased by 7 , while all other numbers remain the same , what is the new average of set s ?
Example Output: 6.

Example Input: Problem: a train 200 m long can cross an electric pole in 5 sec and then find the speed of the train ?
Example Output: 144

Example Input: Problem: a can do a work in 15 days and b in 20 days . if they work on it together for 5 days , then the fraction of the work that is left is
Example Output:
5 / 12