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problem solving 7. How many gallons of a 30% acid-solutions must be added to how many gallons of a 70% acid-solution to 40% acid-solutions? 8.

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7. How many gallons of a 30% acid-solutions must be added to how many gallons of a 70% acid-solution to 40% acid-solutions?

8. A Pharmacist needs to fill an order for a 4% lidocaine solution topical. However, only 2% and 9% concentration are in stock. How much of the 9% concentration should be mixed with 150g of the 2% concentration to get a %4 concentration?

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