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

Example Input: Problem: the sum of all the digits of the integers from 18 to 21 inclusive is 24 ( 1 + 8 + 1 + 9 + 2 + 0 + 2 + 1 = 24 ) . what is the sum e of all the digits of the integers from 0 to 99 inclusive ?
Example Output: 900

Example Input: Problem: a is twice as good a workman as b and they took 6 days together to do the work b alone can do it in .
Example Output: 18 days

Example Input: Problem: in a college the ratio of the numbers of boys to the girls is 8 : 5 . if there are 210 girls , the total number of students in the college is ?
Example Output:
54