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resulting solution is 12% salt

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by sanju09 » Sat Aug 14, 2010 1:58 am
How many liters of a solution that is 10% salt must be added to 3 liters of a solution that is 15% salt so that the resulting solution is 12% salt?
(A) 3
(B) 3.75
(C) 4
(D) 4.75
(E) 5

[spoiler]Source: gmatclub.com[/spoiler]
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by selango » Sat Aug 14, 2010 2:28 am
10/100*x+15/100*3=12/100(x+3)

(10x+45)/100=12(x+3)/100

10x+45=12x+36

2x=9

x=4.5

Am I missing something?
--Anand--
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by ymach3 » Sun Aug 15, 2010 11:15 pm
i too got 4.5

...0.1x+0.045=0.12(x+3)

x=4.5
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by RyanDark » Mon Aug 16, 2010 8:39 am
Is the answer rounded to 5?? I too got 4.5.
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