golden ratio

I am an artist and I have recently become very interested in Josef Muller-Brockman's grid systems however I am very new to this sort of system and would like to better understand the math at work in the construction of the grids so that I can construct a 20 cell grid for a page that is the golden ratio (ie. the height is 1.618 * the width).

I am using the 20 grid on page 77 of Josef Muller-Brockman's Grid Systems in Graphic Design as a reference, however the page the book is printed on is not exactly a golden ratio, nor is the grid area a true golden ratio.

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