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

Example Input: Problem: a car traveled 560 miles per tankful of gasoline on the highway and 336 miles per tankful of gasoline in the city . if the car traveled 6 fewer miles per gallon in the city than on the highway , how many miles per gallon did the car travel in the city ?
Example Output: 9

Example Input: Problem: tourist purchased a total of 30 travelers checks in $ 50 and $ 100 denominations . the total worth of the travelers checks is $ 1800 . how many checks of $ 50 denominations can he spend so that average amount ( arithmetic mean ) of the remaining travelers checks is $ 100 ?
Example Output: 2

Example Input: Problem: an employee ’ s annual salary was increased $ 5,000 . if her new annual salary now equals $ 70,000 , what was the percent increase ?
Example Output:
0.77 %