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GMAT Paper Tests
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 $$3+\frac{4}{\sqrt{5-x}}$$ 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
OA E
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 $$3+\frac{4}{\sqrt{5-x}}$$ 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
OA E
