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150 ml of 30% sulphuric acid was added

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150 ml of 30% sulphuric acid was added [#permalink] New post 21 Feb 2013, 22:14
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Question Stats:

87% (02:26) correct 12% (02:38) wrong based on 3 sessions
150 ml of 30% sulphuric acid was added to approximate 400 ml of 12% sulphuric acid solution. Find the approximate concentration of the acid in the mixture?

A. 1/2
B. 1/3
C. 1/4
D. 1/6
E. 1/5
[Reveal] Spoiler: OA
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Location: India
Concentration: Strategy
Schools: Ross '16, McCombs '16, Kenan-Flagler '16, McDonough '16, Boston U '16, Jones '16, Olin '16
GMAT 1: 740 Q49 V42
GPA: 3.8
WE: Engineering (Energy and Utilities)
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Re: 150 ml of 30% sulphuric acid was added [#permalink] New post 21 Feb 2013, 22:35
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antoxavier wrote:
150 ml of 30% sulphuric acid was added to approximate 400 ml of 12% sulphuric acid solution. Find the approximate concentration of the acid in the mixture?

A. 1/2
B. 1/3
C. 1/4
D. 1/6
E. 1/5


150 ml solution contains 45 ml sulphuric acid
400 ml solution contains 48 ml sulphuric acid
Adding
550 ml solution contains 93 ml sulphuric acid

\frac{93}{550} \approx \frac{90}{540} = \frac{1}{6}

Answer is D
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Re: 150 ml of 30% sulphuric acid was added   [#permalink] 21 Feb 2013, 22:35
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