Question 599530
In case of inverse variation,
If X men can do a job in Y days &
if W man can do the same job in Z days,
then we have X*Y = W*Z

this formula can be used in this problem, 
6 men do the job in 2 days,
Let 2 men do the same job in X days

So 6*2 = 2*X

Solving this we get X = 6

So 2 men take 6 days to do the job (painting)