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

Example Input: Problem: sachin is older than rahul by 7 years . if the ratio of their ages is 11 : 9 , find the age of sachin
Example Output: 38.5

Example Input: Problem: the least number which should be added to 1789 so that the sum is exactly divisible by 5 , 6 , 4 and 3 is ?
Example Output: 11

Example Input: Problem: a train is 250 meter long is running at a speed of 36 km / hour . in what time will it pass a station of 200 meter length ?
Example Output:
45 seconds