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Question 928153: how many liters of water must be added to 7 liters of a 20% acid solution to obtain 10% acid solution
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Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! a 20% acid/water solution is the same as an 80% water/acid solution
a 10% acid/water solution is the same as an 90% water/acid solution
x = liters of water that must be added
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80*7 + 100x = 90(7 + x)
560 + 100x = 630 + 90x
10x = 70
x = 7
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answer:
x = liters of water that must be added = 7
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