SOLUTION: calculate the amount of 70%, 60 %,40% and 30% alcohol should be mixed to give 50% alcohol?

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Question 962220: calculate the amount of 70%, 60 %,40% and 30% alcohol should be mixed to give 50% alcohol?
Answer by Alan3354(69443) About Me  (Show Source):
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calculate the amount of 70%, 60 %,40% and 30% alcohol should be mixed to give 50% alcohol?
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50 is the average --> equal amounts of 70 & 30, and equal amounts of 60 & 40.