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When a cylindrical tank is filled with water at a rate of 22

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When a cylindrical tank is filled with water at a rate of 22 [#permalink] New post 09 Jun 2007, 19:53
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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?

root (10/2)
root 10
4
5
10
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 [#permalink] New post 09 Jun 2007, 20:09
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The answer is B sqrt(10) after some heavy approximating :(

if 22m^3 is raises the water level by .7m then according to cylinder volume formula :
pi * r^2 * .7 = 22
approximate pi to 3
r^2 = 22 / 2.1
r^2 = approximately 10
r = appx sqrt(10).
  [#permalink] 09 Jun 2007, 20:09
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