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

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Question 962221: calculate the amount of 70%, 60 %,40% and 30% alcohol should be mixed to give 50% alcohol?
Answer by Fombitz(32388) About Me  (Show Source):
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There are multiple answers.
One solution.
Equal amounts of 60% and 40% alcohol will yield 50% with no 70% and 30% needed.
60%281%29%2B40%281%29=X%281%2B1%29
60%2B40=2X
2X=100
X=50