Canvas - ((Total Units -1) * Gutter) / Total Units = Unit
950 - ((12 - 1) * 10) / 12 = 70
evn12
(70 * 12) - ((12 - 1) * 10) = 950px
evn6
(70 * 6) - ((6 - 1) * 10) = 470px
evn2
evn4
(70 * 4) - ((4 - 1) * 10) = 310px
odd3
odd3
evn12
(70 * 12) - ((12 - 1) * 10) = 950px