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# The concentration of a certain chemical in a full water tank

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Intern
Joined: 20 Jul 2008
Posts: 6
The concentration of a certain chemical in a full water tank [#permalink]

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20 Aug 2008, 02:15
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The concentration of a certain chemical in a full water tank depends on the depth of the water. At a depth that is x feet below the top of the tank, the concentration is 3+4/SQRT( 5-x) parts per million, where o<x<4. To the nearest 0.1 foot, at what depth is the concentration equal to 6 parts per million.
a) 2.4ft
b) 2.5ft
c)2.8ft
d)3.0f
e)3.2ft
any clues on this one?Thank you OA: highlight for answer is E

Last edited by Ginc on 20 Aug 2008, 06:47, edited 1 time in total.
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Joined: 17 Jun 2008
Posts: 1547
Re: PS: the concentration of a certain: Mixture Problem? [#permalink]

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20 Aug 2008, 03:33
I will equate 6 (parts per million) to 3+4/SQRT( 5-x) resulting in x = 3.2 feet.
Director
Joined: 14 Aug 2007
Posts: 728
Re: PS: the concentration of a certain: Mixture Problem? [#permalink]

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20 Aug 2008, 04:35
same approach as scthakur. By the way it will be good if you post options as well if this is a GMAT question

scthakur wrote:
I will equate 6 (parts per million) to 3+4/SQRT( 5-x) resulting in x = 3.2 feet.
Re: PS: the concentration of a certain: Mixture Problem?   [#permalink] 20 Aug 2008, 04:35
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# The concentration of a certain chemical in a full water tank

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