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

Example Input: Problem: 300 first - time customers of a fashion store were surveyed for their shopping experience right after leaving the store . 60 % of the customers in the survey had purchased clothes for less than $ 100 . 40 % of the customers in the survey reported they were overall satisfied with their purchase . 45 % of the customers that had purchased clothes for less than $ 100 reported they were overall satisfied with their purchase . what percent of the customers surveyed purchased clothes for at least $ 100 and reported that they were not overall satisfied with their purchase ?
Example Output: 13

Example Input: Problem: a train running at the speed of 72 km / hr crosses a pole in 9 seconds . find the length of the train .
Example Output: 180 meter

Example Input: Problem: a mixture of 70 litres of milk and water contains 10 % water . how many litres of water should be added to the mixture so that the mixture contains 12 1 / 2 % water ?
Example Output:
2