Sass is concatenating instead of adding? [duplicate]

Answer 1

Assuming $currentWidth is an integer.

SASS:

$currentWidth: 30;

#example {
  width: unquote( ($currentWidth + 349) + 'px ' + !important );
}

CSS OUTPUT:

#example {
  width: 379px !important;
}

You can test it here:

http://sass-lang.com/try.html