SOLUTION: A chemistry teacher needs to mix a 20% salt solution with a 80% salt solution to make 20 qt of a 35% salt solution. How many quarts of each solution should the teacher mix to get t

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Question 1016198: A chemistry teacher needs to mix a 20% salt solution with a 80% salt solution to make 20 qt of a 35% salt solution. How many quarts of each solution should the teacher mix to get the desired result?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
x=20%
20-x=80%
.20x+0.80(20-x)=(0.20)(35), looking to equalize pure salt on both sides.
.20x+16-0.80x=7
-0.60x=-9
x=15
20-x=5
15 qts. of 20%=3qts. pure
5 qts of 80%=4 qts. pure
total is 7 qts. pure