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A chemistry teacher needs to mix a 20% salt solution with a 80% salt solution to make 15 qt of a 40% salt solution. how many quarts of each solution should the teacher mix to get the desired result?​

 Jan 17, 2020
 #1
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The amount of salt in the finished product equals the amount of salt from the ingredients

Finished product salt = 40% x 15 qt =   .4 x 15 = 6

 

20% solution  volume   x        amount of salt     =   .2x

80% solution  volume = 15-x    amount of salt   = .8 (15-x)    added together   = 6

 

.2x + .8(15-x) = 6

-.6x +12 =6

-.6x = -6

x = 10 qt     amount of 20% solution

15-x =    5 qt = amount of 80% solution

 Jan 17, 2020

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