It's a kind of recipe. You have one thing that's very strong, too strong to use. So to get it down to useful strength it has to be diluted. And that ratio is 1/200. Means if you use one cup of the strong stuff you need to mix it out with 200 cups of water to get it down to useful strength.
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one hundredth
1 unit for every 2 units. For example: Add one oz. sugar to every two oz. water.
16/23 parts mix.
One part per billion (ppb) denotes one part per 1,000,000,000 parts, one part in 109, 1/1,000,000,000 * 100% = 0.0000001% (or 1% = 10,000,000 ppb) and a value of 1 × 10−9. This is equivalent to one drop of water diluted into 250 chemical drums (50 m3), or about three seconds out of a century.
ppt = parts per thousand per cent = part per hundred so 10 ppt = 1 % and then 35 ppt = 3.5%