.col-13 {float:left; width: 33.3333%;}
.col-23 {float:left; width: 66.66666%;}
<div class="row">
<div class="col-13"> </div>
<div class="col-23"> </div>
</div>
<div class="row">
<div class="col-13"> </div>
<div class="col-13"> </div>
<div class="col-13"> </div>
</div>
<div class="row">
<div class="col-23"> </div>
<div class="col-13"> </div>
</div>