Homework Help: Math

Posted by Em on Wednesday, February 1, 2012 at 11:41am.

To have a constant concentration of .25 ppm of a substance with 18,000gal/water flowing, how much would I need to add per minute?
Does that make any sense?
How would I go about answering that? I don't want the answer, but maybe just a push in the right direction because I have NO idea.

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