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Marcia, a lab technician, needs three litres of an 8% saline solution. She has a 5% saline solution and a 9% solution in the lab

Marcia, a lab technician, needs three litres of an 8% saline solution. She has a 5% saline solution and a 9% solution in the lab stock room. How many litres of the 5% and 9% solution should she mix together?

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