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

Ex Input:
Problem: which number can we add to 425897 to get a number exactly divisible by 456 ?

Ex Output:
7


Ex Input:
Problem: you enter a weight loss challenge game and manage to lose 13 % of your body weight . for the final weigh in you are forced to wear clothes that add 2 % to your weight . what percentage of weight loss is measured at the final weigh in ?

Ex Output:
11.26 %


Ex Input:
Problem: the compound ratio of 1 : 2 , 2 : 5 and 3 : 10 ?

Ex Output:

3 : 5