SOLUTION: How much water should be added to 30 gallon of a solution that is 70% antifreeze to bring the antifreeze percentage down to 60%.

Question 166784: How much water should be added to 30 gallon of a solution that is 70% antifreeze to bring the antifreeze percentage down to 60%.
Found 2 solutions by stanbon, josmiceli:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!

How much water should be added to 30 gallon of a solution that is 70% antifreeze to bring the antifreeze percentage down to 60%.
------------------------------------
antifreeze + antifreeze = antifreeze
0.70*30 + 0*x = 0.60(30+x)
Multiply thru by 100 to get:
70*30 + 0 = 60(30+x)
2100 = 1800 + 60x
60x = 300
x = 5 gallons (amount of pure water hat should be added to the mixture )
=====================
Cheers,
Stan
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
In words:
(gallons of antifreeze in final solution)/(gallons of solution) = % antifreeze
Let = the gallons of water to be added
The gallons of final solution will be

Initially there is 70% antifreeze
gallons

5 gallons of water must be added to get a 60% solution
check:

OK
RELATED QUESTIONS
How much water should be added to 1 gallon of pure antifreeze to obtain a solution that... (answered by rapaljer)
How much water should be added to 1 gallon of pure antifreeze to obtain a solution that... (answered by stanbon)
How much water should be added to 1 gallon of pure antifreeze to obtain a solution that... (answered by ankor@dixie-net.com)
How much water should be added to 1 gallon of pure antifreeze to obtain a solution that... (answered by Alan3354)
How much water should be added to 1 gallon of pure antifreeze to obtain a solution that... (answered by ptaylor)
How much water should be added to 1 gallon of pure antifreeze to obtain a solution that... (answered by ankor@dixie-net.com)
How much water should be added to 1 gallon of pure antifreeze to obtain a solution that... (answered by Fombitz)
how much water should be added to 1 gallon of pure antifreeze to obtain a solution that... (answered by nerdybill)
How much water should be added to 1 gallon of antifreeze to obtain a solution that is 60% (answered by Jk22)