How to make a div fill a remaining horizontal space?

Question

I have 2 divs: one in the left side and one in the right side of my page. The one in the left side has fixed width and I want the one of the right side to f

Answer 1

I tried the above solutions for a liquid left, and a fixed right but non of them worked (I am aware the question is for the reverse but I think this is relevant). Here's what did work:

.wrapper {margin-right:150px;}
.wrapper .left {float:left; width:100%; margin-right:-150px;}

.right {float:right; width:150px;}