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

Ex 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 ?

Ex Output:
30

Ex Input:
Problem: what is the sum of the multiples of 4 between 63 and 151 inclusive ?

Ex Output:
233

Ex Input:
Problem: how many digits are in ( 8 10 ^ 12 ) ( 10 10 ^ 9 ) ?

Ex Output:
23