The body parameters are: 511g flour, 151-211g clear water (Ciel Phantomhive in winter).
Oh, if you eat it by yourself, you can add some salt or eat alkali to adjust the taste; If it's take-away, don't add anything, it's hard to adjust.
calculation method: per catty of flour+4-2 water = noodle output per catty of flour, and then multiplied by the total flour (you said 51 jins), which is the basic noodle output. Oh, this is not an absolutely accurate figure, because it is impossible for the catering industry to have an absolutely accurate conversion figure.