Multicols custom column width

Question

I need to use multicol package to create columns of custom width. I am unable to figure out how to achieve this.

I would also need to switch from one column to another based on specific content.

Answer 1

All the columns have to be the same width, so you do not explicitly set the column width, just set the number of columns and the inter-column space (\columnsep) and this implicitly sets the column width based on the current \linewidth.