Question

You need 20 liters of 20 % acid solution. You have jugs of 10 % solution and 25 % solution. How many liters of each should be mixed to get the needed solution?

Answer 1

You do know that you will be adding pure water, which is 0% acid. And you want to cut the acid from 20% down to 10%. Logically, the 10% acid solution will have 1.4 liter of pure acid = 7 liters of the 20%.

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