SOLUTION: A chemist has a concentrated washing solution. If she has 2 liters of the 50% solution how much water must be added to dilute it to a 20% solution?

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Question 826416: A chemist has a concentrated washing solution. If she has 2 liters of the 50% solution how much water must be added to dilute it to a 20% solution?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
The water by itself does not add any washing solution. Zero percent washing solution.
See in my profile for the lesson Mixture: two concentrations, but in this example, M=2%2Bw, in which w is how much water to add, and M, not really needed, is the final amount of total mixture.

2%2A50%2F%28w%2B2%29=20 is all you need. Note that the expression w%2A0=0, would not be necessary as part of the numerator. You could use it, but absolutely not necessary.