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TheTonik

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**Problem Solving.... Problem**

For the love of God I need some help.... Here is the question:

How much water should be added to 20 gallons of a solution that is 50% antifreeze in order to get a mixture that is 30% antifreeze?

I came up with two answers but am not sure if either are correct: 7.5 gallons and 12 gallons.

Can anyone help me?