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# concentration of certain chemical

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Manager
Joined: 06 May 2009
Posts: 78
Followers: 2

Kudos [?]: 5 [0], given: 3

concentration of certain chemical [#permalink]  23 Jun 2009, 04:01
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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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/sq root (5-x))) parts per million, where 0 < x < 4. To the nearest 0.1 foot, at what depth is the concentration equal to 6 parts per million?

(A) 2.4 ft
(B) 2.5 ft
(C) 2.8 ft
(D) 3.0 ft
(E) 3.2 ft
Senior Manager
Joined: 16 Jan 2009
Posts: 362
Concentration: Technology, Marketing
GMAT 1: 700 Q50 V34
GPA: 3
WE: Sales (Telecommunications)
Followers: 2

Kudos [?]: 60 [1] , given: 16

Re: concentration of certain chemical [#permalink]  23 Jun 2009, 04:06
1
KUDOS
(3 + (4/sq root (5-x)))=6
(4/sq root (5-x))=3
sq root (5-x)=4/3
x=5-(16/9)
x=3.2
_________________

Lahoosaher

Manager
Joined: 06 May 2009
Posts: 78
Followers: 2

Kudos [?]: 5 [0], given: 3

Re: concentration of certain chemical [#permalink]  23 Jun 2009, 06:18
Re: concentration of certain chemical   [#permalink] 23 Jun 2009, 06:18
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