SOLUTION: streakfree window cleaner is 12% alcohol and sunstream window cleaner is 30% alcohol. how much of each should be used to make 90 oz. of a cleaner that is 20% alcohol?

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Question 228458: streakfree window cleaner is 12% alcohol and sunstream window cleaner is 30% alcohol. how much of each should be used to make 90 oz. of a cleaner that is 20% alcohol?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
streakfree window cleaner is 12% alcohol and sunstream window cleaner is 30% alcohol. how much of each should be used to make 90 oz. of a cleaner that is 20% alcohol?
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Equation:
alcohol + alcohol = alcohol
0.12x + 0.30(90-x) = 0.20*90
Multiply thru by 100 to get:
12x + 30*90 - 30x = 20*90
-18x = -10*90
x = 50 oz (amt. of 12% solution in the mixture)
90-x = 40 oz (amt. of 30% solution in the mixture)
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Cheers,
Stan H.