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Marty has available  a 20% alcohol solution and a 70% alcohol solution.  How many liters of each solution should be mixed to make 30 L of a 50% alcohol solution?

 Jun 30, 2020
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x = 20 %

30 -x = 70%

 

20% x    +  70% (30-x)      =  50% (30)

.2x + 21 - .7x = 15

x = 12 l of 20%      18 l of 70 %

 Jun 30, 2020

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