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

Ex Input:
Problem: how many liters of a 40 % iodine solution need to be mixed with 35 liters of a 20 % iodine solution to create a 34 % iodine solution ?

Ex Output:
13


Ex Input:
Problem: the average of first 22 natural numbers is ?

Ex Output:
11.5


Ex Input:
Problem: a corporation paid $ 10 million in federal taxes on its first $ 50 million of gross profits and then $ 30 million in federal taxes on the next $ 150 million in gross profits . by approximately what percent did the ratio of federal taxes to gross profits increase from the first $ 50 million in profits to the next $ 150 million in profits ?

Ex Output:

0 %