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

[Q]: 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 ?
[A]: c ) 30

[Q]: Problem: a dealer purchases 15 articles for rs . 25 and sells 12 articles for rs . 32 . find the profit percentage ?
[A]: 60

[Q]: Problem: if 30 men take 15 days to to complete a job , in how many days can 25 men finish that work ?
[A]:
18