SOLUTION: How many liters of pure water should be mixed with a 2L solution of 70% acid to produce a mixture that is 50% water?

Question 987907: How many liters of pure water should be mixed with a 2L solution of 70% acid to produce a mixture that is 50% water?
Found 2 solutions by josgarithmetic, solver91311:
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
two part mixture, one part unknown
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

70% of 2 liters is 1.4 liters of acid. Once you make the 50% mix, you will have 1.4 liters of acid, and you must have 1.4 liters of water. But in the 2 liters of 70% solution, you already have 0.3 times 2L = 0.6 liters of water, hence, you must add 0.8 liters of water.

John

My calculator said it, I believe it, that settles it

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