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

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

Ex Output:
0.5


Ex Input:
Problem: the ratio between the sale price and the cost price of an article is 12 : 7 . what is the ratio between the profit and the cost price of that article ?

Ex Output:
5 : 7


Ex Input:
Problem: the product of two positive integers is 675 and their difference is 2 . what is the bigger number ?

Ex Output:

27