SOLUTION: How much water should be added to 30 gallons of a solution that is 70% antifreeze in order to get a mixture that is 60% antifreeze?

Question 16261: How much water should be added to 30 gallons of a solution that is 70% antifreeze in order to get a mixture that is 60% antifreeze?
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Here's one approach: the 30 gallons of 70% antifreeze solution is 30% water and you want to make a solution that is 60% antifreeze and 40% water. So you will add x gallons of water to the 30% water solution.
Change the percents to their decimal equivalents.
Simplify and solve for x, the number of gallons of water to be added.
Subtract 0.4x from both sides.
Subtract 9 from both sides.
Finally, divide both sides by 0.6

You will need to add 5 gallons of water to the 30 gallons of 70% antifreeze solution to make 35 gallons of 60% antifreeze solution.
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