SOLUTION: Faith mixes 14 liters of 12% acid solution with a 30% acid solution to make an 18% acid solution. How many liters of 30% solution did she use?

Question 937361: Faith mixes 14 liters of 12% acid solution with a 30% acid solution to make an 18% acid solution. How many liters of 30% solution did she use?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = liters of 30% acid
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0.12*14 + 0.30x = 0.18(x + 14)
1.68 + 0.30x = 0.18x + 2.52
0.30x - 0.18x = 2.52 - 1.68
0.12x = 2.52 - 1.68
x = (2.52 - 1.68)/0.12
x = 7
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answer:
7 liters of 30% acid
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