SOLUTION: The nurse has 2.68 liter(s) of a solution that is 81.8% alcohol. How many liters of pure alcohol must she add to bring the solution up to a 94.8% concentration? How would I sol

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Question 756380: The nurse has 2.68 liter(s) of a solution that is 81.8% alcohol. How many liters of pure alcohol must she add to bring the solution up to a 94.8% concentration?
How would I solve this?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
2680 ml. of the 81.8% alcohol.

Using v=volume of the pure alcohol, 100%, the add,
highlight%28%282680%2A81.8%2Bv%2A100%29%2F%282680%2Bv%29=94.8%29
Solve for v.

2680%2A81.8%2Bv%2A100=94.8%2A2680%2B94.8%2Av
%28100-94.8%29v=%2894.8-81.8%29%2A2680
just continue until done.