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IBU math question!

A customer wanted me to measure out "enough Magnum for 200 IBUs". I called him and asked him what he meant and he said that the magnum is the bittering hop for all his 5 gallon batches. He needs 15 IBUs here, 30 IBUs there, ect. When he adds all his IBUs up from across his batches it is around 200. So he needes the amount that will satisfy that. So can anyone think of a way to calculate that amount? I know it will change by pre-boil gravity and such but Im looking for a ballpark equation.

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