I want to adjust the columns in Twitter Boοtstrap.
I know in bootstrap there are 12 columns grid. Is there any way to manipulate the grids to have 1.5 3.5 3.5 3.5 i
As @bodi0 correctly said, it is not possible. You either have to extent Bootstrap's grid system (you can search and find various solutions, here is a 7-column example) or use nested rows e.g. http://bootply.com/dd50he9tGe.
In the case of nested rows you might not always get the exact result but a similar one
1.67 (close to 1.5)
3.33 (close to 3.5)
3.5
3.5