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: the average of first 17 even numbers is ?

Ex Output:
18


Ex Input:
Problem: in what ratio mental a at rs . 68 per kg be mixed with another metal at rs . 96 per kg so that cost of alloy ( mixture ) is rs . 82 per kg ?

Ex Output:

1 : 1