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2ml of A and 2ml of B mixed together or 50 drops added to 1 gallon of water makes a 50 ppm solution. We need

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2ml of A and 2ml of B mixed together or 50 drops added to 1 gallon of water makes a 50 ppm solution. We need to use 2ml of diluted solution. How much concentrate is in 2ml of diluted solution

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