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

Example Input: Problem: 5 years ago , paula was 3 times as old as karl . in 6 years , paula will be twice as old as karl . what is the sum of their ages now ?
Example Output: 54

Example Input: Problem: find the least number must be subtracted from 105829 so that remaining no . is divisible by 21 ?
Example Output: 10

Example Input: Problem: one side of a rectangular field is 14 m and one of its diagonal is 17 m . find the area of the field .
Example Output:
134.4