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

Ex Input:
Problem: by selling an article for $ 195 , a person gains $ 45 . what is the gain % ?

Ex Output:
30 %


Ex Input:
Problem: the h . c . f of two numbers is 23 and the other two factors of their l . c . m are 14 and 15 . the larger of the two numbers is :

Ex Output:
345


Ex Input:
Problem: convert the 13 / 54 m / s into kilometers per hour ?

Ex Output:

0.86