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

Example 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 ?
Example Output: 11.26 %

Example Input: Problem: a contractor undertook to do a piece of work in 18 days . he employed certain number of laboures but 9 of them were absent from the very first day and the rest could finish the work in only 6 days . find the number of men originally employed ?
Example Output: 4.5

Example Input: Problem: the sum of two numbers is 77 . 5 times one number is equal to 6 times the other . the bigger of the two numbers is
Example Output:
42