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

Ex Input:
Problem: solution y is 30 percent liquid x and 70 percent water . if 2 kilograms of water evaporate from 6 kilograms of solution y and 2 kilograms of solution y are added to the remaining 4 kilograms of liquid , what percent of this new solution is liquid x ?

Ex Output:
40 %


Ex Input:
Problem: what is the sum of natural numbers between 30 and 100

Ex Output:
4615


Ex Input:
Problem: a car runs 375 km in 3 hours . what ' s the car ' s speed ?

Ex Output:

125