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

Example Input: Problem: a train running at the speed of 72 km / hr crosses a pole in 9 seconds . find the length of the train .
Example Output: 180 meter

Example Input: Problem: the average of first 17 even numbers is ?
Example Output: 18

Example Input: Problem: jerome anticipated that the webweb . com stock price would fall and sold all his webweb . com stocks for $ 5 per stock . he paid $ 10,000 tax on the revenue . a week later , jerome became convinced that the webweb . com stock price would rise , and he used the money that he had gotten from selling the webweb . com stocks to purchase them again , this time at $ 6 per stock . if jerome ended up having 7000 webweb . com stocks fewer than the number he had before selling them , how many webweb . com stocks did he have originally ?
Example Output:
17,000