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

Example Input: Problem: a man , a woman and a boy can together complete a piece of work in 3 days . if a woman alone can do it in 6 days and a boy alone in 18 days , how long will a man take to complete the work ?
Example Output: 9 days

Example Input: Problem: the number of positive integer solutions for the equation x + y + z + t = 30 is
Example Output: 3654

Example Input: Problem: for the past n days , the average ( arithmetic mean ) daily production at a company was 50 units . if today ' s production of 110 units raises the average to 55 units per day , what is the value of n ?
Example Output:
11