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December 20, 2014

December 20, 2014

Posted by **Carllll needs help** on Friday, April 13, 2007 at 6:02pm.

The amount of water has not changed.

Since the final solution is 180 ml and is 75% alcohol, 25% or 45 ml must be water.

So that 45 ml of water must have been in the original 150 ml of the mixture which means 105 ml must have been alcohol

then the alcohol concentration of the original mixture was 105/150 or 70%

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