I need you to do me a math, I think it's easy and tricky at the same time.
I have a pair value of font size and line height, 13px-20px, where 13px is font size and 20px is line height.
Condition, if font-size increases by 1, line-height will increase by 2. So 14px font-size will result 22px line height.
Now, if given a font-size value, can you figure out the line height?