SOLUTION: 320ml of 30% alcohol soln, convert this to 50% alcohol soln by adding 70% alcohol soln.

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Question 157679: 320ml of 30% alcohol soln, convert this to 50% alcohol soln by adding 70% alcohol soln.
Answer by Fombitz(13823) About Me  (Show Source):
You can put this solution on YOUR website!
Adding x ml of 70% solution, the balance equation becomes,
50%28320%2Bx%29=30%28320%29%2B70%28x%29
Solve for x.
50%28320%2Bx%29=30%28320%29%2B70%28x%29
16000%2B50x=9600%2B70x
-20x=-6400
x=320
Add 320 ml of 70% solution.