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

Example Input: Problem: in what time will a train 50 m long cross an electric pole , it its speed be 360 km / hr ?
Example Output: 0.5

Example Input: Problem: 13 buckets of water fill a tank when the capacity of each bucket is 42 litres . how many buckets will be needed to fill the same tank , if the capacity of each bucket is 6 litres ?
Example Output: 91

Example Input: Problem: a batsman makes a score of 87 runs in the 17 th inning and thus increases his average by 3 . find his average after 17 th inning .
Example Output:
39