scss is not divisible by 2?

Question

Layout

I decided to try sass, I like everything, except for one thing, but something is wrong with the math, either with me or with him:

it seemed to me that the red block should become 480px, but when I opened the browser, I found that it became 320, why not half of 960?

Answer 1

you have a question mark on the screen, if you look closely, there is a redefinition of the "column-big" class to
width: $wrapper-size / 3;