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

Ex Input:
Problem: how many multiples of 7 are there between 10 and 100 ( both are inclusive ) ?

Ex Output:
13


Ex Input:
Problem: a , b and c start a business each investing 20,000 . after 6 months a withdrew 5000 , b withdrew 4000 and c invests 6000 more . at the end of the year , a total profit of 67,600 was recorded . find the share of b .

Ex Output:
21,600


Ex Input:
Problem: when 2 / 9 of the votes on a certain resolution have been counted , 3 / 4 of those counted are in favor of the resolution . what fraction q of the remaining votes must be against the resolution so that the total count will result in a vote of 2 to 1 against the resolution ?

Ex Output:

11 / 14