SOLUTION: how many litres of 50% alchol solution must be mixed with 90 liters of 80% solution to get a 70% soulton

Question 997875: how many litres of 50% alchol solution must be mixed with 90 liters of 80% solution to get a 70% soulton
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = liters of 50% alcohol needed
= liters of alcohol in 50% solution
liters of alcohol in 80% solution
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45 liters of 50% alcohol are needed
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check:

OK
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