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**44halfj****Member**- Registered: 2008-01-27
- Posts: 1

How do you set this one up?

If you have an unknown amount of 30% solution and an unknown amount of 70 % solution, how much of each doyou need to make 12L of 45 % solution?

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**JaneFairfax****Member**- Registered: 2007-02-23
- Posts: 6,868

If you mix *V* litres of the first solution and *W* litres of the second solution, the concentration of your resulting solution will be

You want

and

So just solve the two simultaneous equations in *V* and *W* for your answer.

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