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A scientist needs 10 liters of a 20% acid solution for an experiment, but she has only a 5% solution and a 40% solution. To the nearest tenth of a liter, about how many liters of the 5% and the 40% solutions should she mix to get the solution she needs?

 Sep 25, 2020
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10 liters total      x = 5%    10-x = 40%

 

amount of ingredients   =   final amount

 

.05 x    +  .40(10-x)     = .20 (10)     

                                      solve for 'x' the amount of 5%    then  10-x = 40% amount

 Sep 25, 2020

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