SOLUTION: I have 30 gallons of water, I need to add antifreeze to get a 60% water and 40% antifreeze mixture. How much antifreeze do I need to add?

Question 825164: I have 30 gallons of water, I need to add antifreeze to get a 60% water and 40% antifreeze mixture. How much antifreeze do I need to add?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
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for a 40/60 antifreeze/water solution, to 30 gallons of pure water, add:
x = gallons of 100% antifreeze
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0(30) + 100x = 40(x + 30)
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100x = 40x + 1200
60x = 1200
x = 20
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answer:
add 20 gallons of 100% antifreeze
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