Question 210392: how many liters of 9% salt solution and 15% salt solution are needed to make 18 liters of 10% salt solution Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website! how many liters of 9% salt solution and 15% salt solution are needed to make 18 liters of 10% salt solution
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n = 9%
f = 15%
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n+f = 18 liters
0.09n + 0.15f = 0.1*18 (total of salt)
9n + 15f = 180
n = 18-f
Sub for n
9(18-f) + 15f = 180
162 - 9f + 15f = 180
6f = 18
f = 3 liters
n = 15 liters
