SOLUTION: How much pure antifreeze should be added to 3 gallons of a 50% antifreeze solution to produce a solution that is 60% antifreeze? I did a table already containing the total amoun

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Question 382783: How much pure antifreeze should be added to 3 gallons of a 50% antifreeze solution to produce a solution that is 60% antifreeze?
I did a table already containing the total amount at the bottom known as .6 for me but I really don't understand this question.
Thanks,
Jazlyn

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Pure antifreeze is a 100% solution.
Let A be the amount of pure antifreeze.
Look at the concentration equation.
100A%2B50%283%29=60%28A%2B3%29
100A%2B150=60A%2B180
40A=30
highlight%28A=3%2F4%29gallons