SOLUTION: David adds 300 mL of water to 450 mL of 60% alcohol solution so as to dilute its concentration to 40%. Does he add too much water to the solution?

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Question 1103983: David adds 300 mL of water to 450 mL of 60% alcohol solution so as to dilute its concentration to 40%. Does he add too much water to the solution?
Found 2 solutions by Alan3354, josgarithmetic:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
David adds 300 mL of water to 450 mL of 60% alcohol solution so as to dilute its concentration to 40%. Does he add too much water to the solution?
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450*60 + 300*0 = C*750
C = 36%

Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
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David adds 300 mL of water to 450 mL of 60% alcohol solution so as to dilute its concentration to ....
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450%2A60%2F%28450%2B300%29

450%2A60%2F750

45%2A60%2F75
%289%2A5%2A3%2A20%29%2F%283%2A5%2A5%29

%289%2A5%2A3%2A5%2A4%29%2F%283%2A5%2A5%29

36

36% alcohol solution result.
Did he add too much water? YES, because he wanted "40%" alcohol.