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

Ex 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 ?

Ex Output:
9 days


Ex Input:
Problem: a train running at the speed of 40 km / hr crosses a pole in 9 seconds . what is the length of the train ?

Ex Output:
100 meter


Ex Input:
Problem: a can do a work in 6 days , b can do a work in 8 days and c can do it in 12 days . b left work after 5 days . for how many number of days should a and c should work together to complete the remaining work ?

Ex Output:

2 / 3