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

Ex Input:
Problem: in x game of billiards , x can give y 20 points in 60 and he can give z 30 points in 60 . how many points can y give z in x game of 120 ?

Ex Output:
30


Ex Input:
Problem: mary can do a piece of work in 26 days . rosy is 30 % more efficient than mary . the number of days taken by rosy to do the same piece of work is ?

Ex Output:
20


Ex Input:
Problem: by selling an article at rs . 600 , a profit of 60 % is made . find its cost price ?

Ex Output:

375