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22 Sep 2007, 08:26
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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22 Sep 2007, 10:49
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I get the answer as 100 gms...is that one of the options ? Once you confirm, I'll tell you how I got that answer. 
22 Sep 2007, 18:10
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Vlad77
lets say Y is the amount of 24% solution, we need to find Y.
in this 24% solution there is 0,24Y of alcohol and (1-0,24)Y=0,76Y of water.
the resulting solution`s ratio of alcohol to water is 0,16/(1-0,16) = 0,16/0,84
0,16=0,24(2/3), since the stem says the concentration dropped by 1/3
total amount of alcohol in the resulting solution is 0,24Y+0 and total amount of water in resulting solution is (0,76Y+200), thus ratio is
0,24Y/(0,76Y+200)=0,16/0,84
if we solve for Y, we get the answer
i wonder if there is better approach, solving the resulting equation will take time..
