SOLUTION: How many quarts if a 40% alchohol solution must be mixed with 3 quarts of pure water to make a 28% solution? This is what I am doing but I am getting a negative answer: (

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Question 606963: How many quarts if a 40% alchohol solution must be mixed with 3 quarts of pure water to make a 28% solution?


This is what I am doing but I am getting a negative answer:
(3*1)+(x*.3)=(3+x*.28)
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
How many quarts if a 40% alcohol solution must be mixed with 3 quarts of pure water to make a 28% solution?
:
Let x = amt of 40% solution required
:
.40x = .28(x+3)
.40x = .28x + .84
.40x - .28x = .84
.12x = .84
x = .84/.12
x = 7 quarts of 40% solution required
:
:
Check this
.4(7) = .28(7+3)
2.8 = .28(10)