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a scientist needs 10 litres 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 litres of the 5% and the 40% should she mix to get the solution she needs?

 Sep 26, 2020
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10 liters total

x = 5%           amount of acid  =   .05x

10-x = 40%    amount of acid = .40 (10-x)

 

Sum of ingredients = amount in final solution

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

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

 Sep 26, 2020

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