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

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: two cars start at the same time from opposite ends of a highway that is 175 miles long . one car is riding at 25 mph and the second car is riding at 45 mph . how long after they begin will they meet ?

Ex Output:
2.5


Ex Input:
Problem: 80 % of the population of a village is 64000 . the total population of the village is ?

Ex Output:

80000