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

Example Input: Problem: 6 ) a marketing firm determined that , of 260 households surveyed , 80 used neither brand a nor brand b soap . 60 used only brand a soap and for every household that used both brands of soap , 3 used only brand b soap . how many of the 200 household surveyed used both brands of soap ?
Example Output: c ) 30

Example Input: Problem: two cubes have their volumes are in the ratio 1 : 27 . find the ratio of their surface area ?
Example Output: 1 : 9', 'd ) 2 : 7', 'e ) 3 : 11'

Example Input: Problem: of the 200 employees in a certain company , 30 percent will be relocated to city x and the remaining 70 percent will be relocated to city y . however , 40 percent of the employees prefer city y and 60 percent prefer city x . what is the highest possible number of employees who will be relocated to the city they prefer ?
Example Output:
140