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You mix 325 gallons of a mixture containing 12 wt% NaCl (sodium chloride) and 88 wt%...

You mix 325 gallons of a mixture containing 12 wt% NaCl (sodium chloride) and 88 wt% water (solution density = 1.0837 g/cm3) with a unknown volume of solution that is 20 wt% NaCl and 80 wt% water (solution density = 1.1453 g/cm3). You want to produce a mixture containing 19 wt% NaCl. Find the volume of the second feed solution.

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