Visual Composer help - Columns from 1/2, 1/2 to 1/3, 2/3

Hi folks, first post here so hopefully I’m posting in the right place.

Quite simply I have 2 columns on my page. One image column and one text column, the columns are side by side each taking up the same width (1/2, 1/2).
I want the image column on the left to take up 1/3 of the page and the text column on the right to take up 2/3 of the page.
Please see attached screen so you can see my current setup with VC.
Could someone please tell me how to achieve my goal here? Would it help if I posted the page screen shot as well?

Thanks.

Hello there,

This forum is for general issues and for theme/plug-in support, you should contact the author.
I’m guessing you have purchased one theme with VC included, so at this point, you should contact the theme author.

Hope this helps