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The concentration of a certain chemical in a full water tank [#permalink]
21 Mar 2006, 21:40
100% (02:34) correct
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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 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