GMATT73 wrote:
When a cylindrical tank is filled with water at a rate of 22 cubic meters per hour, the level of water in the tank rises at a rate of 0.7 meters per hour. Which of the following best approximates the radius of the tank in meters?
A. √10/2
B. √10
C. 4
D. 5
E. 10
We are basically told that a cylinder with a height of 0.7 (7/10) meters has the volume of 22 cubicmeters.
volume_{cylinder}=\pi{r^2}h=22 -->\pi{\approx{\frac{22}{7}}} --> \frac{22}{7}*r^2*\frac{7}{10} =22
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