SOLUTION: How many liters of a 5% salt solution must be added to 2 liters of a 2% salt solution in order to obtain a mix?

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Question 790900: How many liters of a 5% salt solution must be added to 2 liters of a 2% salt solution in order to obtain a mix?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
You gave an incomplete question. Expect some resultant concentration, T for the mixture.

Let v = volume in liters of the 5% salt to add.

highlight%28%285v%2B2%2A2%29%2F%28v%2B2%29=T%29
5v%2B4=T%28v%2B2%29
5v%2B4=Tv%2B2T
5v-Tv=2T-4
v%285-T%29=2T-4
highlight%28v=%282T-4%29%2F%285-T%29%29

When you know what value of T you want, you can find the value for v.