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

Example Input: Problem: john left home and drove at the rate of 45 mph for 2 hours . he stopped for lunch then drove for another 3 hours at the rate of 45 mph to reach his destination . how many miles did john drive ?
Example Output: 225 miles .

Example Input: Problem: the average of first 5 multiples of 5 is
Example Output: 1

Example Input: Problem: which number need to add to 859622 to get a number divisible by 456 ?
Example Output:
85962