SOLUTION: how many ounces of vermouth containing 20% alcohol should be added to 10 ounces of gin containing 50% alcohol to make a pitcher of martinis that contain 30% alcohol. How much ounce

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Question 940755: how many ounces of vermouth containing 20% alcohol should be added to 10 ounces of gin containing 50% alcohol to make a pitcher of martinis that contain 30% alcohol. How much ounces of vermouth do we add?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The exercise is of this type:

http://www.algebra.com/my/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev

That explains how the solution works.