Half columns in Twitter Bootstrap 3

You can try this :

Just split a col-9 in 2 parts.

Bootply : http://www.bootply.com/128927

HTML :

   <div class="col-xs-3">  col-xs-3 </div>
   <div class="col-xs-9">
      <div class="row">
         <div class="col-xs-6">col-xs-4.5</div>
         <div class="col-xs-6">col-xs-4.5  </div>
      </div>
   </div>