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

Example Input: Problem: a company pays 12.5 % dividend to its investors . if an investor buys rs . 60 shares and gets 25 % on investment , at what price did the investor buy the shares ?
Example Output: 30

Example Input: Problem: a and b together can complete work in 6 days . a alone starts working and leaves it after working for 4 days completing only half of the work . in how many days it can be completed if the remaining job is undertaken by b ?
Example Output: 12

Example Input: Problem: find the value of ( 100 + 20 / 90 ) × 90
Example Output:
902