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Doc has available to have 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?

 Feb 18, 2020
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We have this equation

 

.20 x  + .70 ( 30 - x) = .50 (30)    simplify

 

.20 x  + 21 - .70x   =   15

 

-.50x  + 21 =  15     subtract  21  from both  sides

 

-.5x  =  -6    divide  both sides  by - .5

 

x =  12     [ L  of 20% solution  ]

 

(30  - x)  =   (30 -12)  =  18  [ L of  70% solution ]

 

 

 

cool cool  cool

 Feb 18, 2020

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