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

Example Input: Problem: for any positive integer n , the sum of the first n positive integers equals n ( n + 1 ) / 2 . what is the sum of odd all the integers between 10 and 100 ?
Example Output: 2475

Example Input: Problem: the difference between the place values of two nines in the numerical 62039295 is
Example Output: 8910

Example Input: Problem: of the 65 cars on a car lot , 45 have power steering , 25 have power windows , and 17 have both power steering and power windows . how many of the cars on the lot have neither power steering nor power windows ?
Example Output:
12