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In a chem lab, you have in stock a 10% saline solution and a 50% saline solution. However, you need to create 500 milliliters (mL)

In a chem lab, you have in stock a 10% saline solution and a 50% saline solution. However, you need to create 500 milliliters (mL) of a 40% saline solution. How much of each should you mix to obtain the desired solution?

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