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: find the area of a parallelogram with base 10 cm and height 20 cm .

Ex Output:
200


Ex Input:
Problem: a person saved $ 10 in buying an item on sale . if he spent $ 500 for the item , approximately how much percent he saved in the transaction ?

Ex Output:

2 %