SOLUTION: "Arctic Antifreeze" is 18% alcohol and "Frost No-More" is 10% alcohol. How many liters of Arctic Antifreeze should be mixed with 7.5oz of frost no-more in order to get a mixture th

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Question 265853: "Arctic Antifreeze" is 18% alcohol and "Frost No-More" is 10% alcohol. How many liters of Arctic Antifreeze should be mixed with 7.5oz of frost no-more in order to get a mixture that is 15% alcohol?

Answer by mananth(16946) About Me  (Show Source):
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Arctic Antifreeze" is 18% alcohol and "Frost No-More" is 10% alcohol. How many liters of Arctic Antifreeze should be mixed with 7.5oz of frost no-more in order to get a mixture that is 15% alcohol?
Antifreeze----------------- frost no more---------------- mix
18%-------------------------------10%-----------------------15%
x-7.5----------------------------------7.5oz---------------------x
0.18(x-7,5) +0.1*7.5 =0.15x
0.18x-1.35+0.75 =0.15x
0.03x=1.35-0.75
0.03x=0.6
x= 20
20 oz