The width of each column is 2 inches.
Width is the measurement of something from side to side.
Let x = width of each column.
If a "gutter" is one eighth as wide as each column, then the width of the gutter can be expressed as
gutter = (1/8)x
If the document is 8.5 in. wide, then the sum of the widths of the left and right margins, the 3 columns and the 2 gutters in between columns is equal to 8.5 in.
left margin + right margin + 3 columns + 2 gutters = 8.5in
1 in + 1 in + 3x + 2(1/8)x = 8.5 in
3x + 2(1/8)x = 8.5 in - 1 in - 1 in
3 1/4 x = 6.5 in
x = 2 in
width of each column = 2 inches
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