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HTML

              
                <div class="container">
  <section>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quidem voluptate mollitia, tempore esse sapiente eos aut eligendi omnis sint illo numquam iusto atque deserunt cum qui! Soluta reiciendis, fuga commodi maxime doloribus alias rem in quas, aut hic voluptates eaque.
  </section>
  <aside>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Expedita dolore dicta enim cum, excepturi odio doloremque, necessitatibus, ullam nostrum quos dolores pariatur. Itaque laborum unde vero, minima facilis iure. Neque, quos facere numquam voluptatum cupiditate accusamus dolorem quia porro impedit.
  </aside>
</div>
              
            
!

CSS

              
                // vars
$grid: (
  cantidad-col: 12,
  ancho-col: 60px,
  margen: 20px,
  container: 960px
);

// functions
@function calc-container($grid: $grid) {
  @return (map-get($grid, ancho-col) + map-get($grid, margen)) * map-get($grid, cantidad-col);
}

@function calc-col($cantidad-col, $grid: $grid) {
  @return (map-get($grid, ancho-col) * $cantidad-col) + (map-get($grid, margen) * $cantidad-col) - map-get($grid, margen);
}

@function calc-gutter($gutter) {
  @return $gutter / 2;
}

.container {
  margin: 0 auto;
  width: calc-container();
  
  &:after {
    clear: both;
    content: '';
    display: block;
  } 
}

section {
  float: left;
  margin: 0 calc-gutter(map-get($grid, margen));  
  width: calc-col(8);
}

aside {
  float: left;
  margin: 0 calc-gutter(map-get($grid, margen));
  width: calc-col(4);
}

              
            
!

JS

              
                
              
            
!
999px

Console