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

Ex Input:
Problem: if the average of 5 x and 8 y is greater than 90 , and x is twice y , what is the least integer value of x ?

Ex Output:
4


Ex Input:
Problem: a cycle is bought for rs . 900 and sold for rs . 1170 , find the gain percent ?

Ex Output:
30 %


Ex Input:
Problem: how much water should be added to 13 liters of a 20 % - solution of alcohol to reduce the concentration of alcohol in the solution by 75 % ?

Ex Output:

27 liters