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Bootstrap-3 - Interview Questions
Why does Bootstrap have 12 columns ?
Bootstrap has a 12-unit grid (instead of 10, 16, etc..) is that 12 evenly divides into 6 (halves), 4 (quarters) and 3 (thirds). This makes adapting to a variety of 

layouts much easier. Bootstrap’s grid columns are identified by different col-(breakpoint)-(units) CSS classes. So for example, col-md-3 would be a column that takes up 3 of the 12 units (or 25%) across in a row.

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