Mathematics, 01.06.2020 06:58 Rboltonbcs
The safe fluoride-to-water ratio is 0.2 to 2.8 parts per million (ppm) gallons. What is the range in parts of fluoride that could be added to 250,000 gallons of water?
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The safe fluoride-to-water ratio is 0.2 to 2.8 parts per million (ppm) gallons. What is the range in...
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