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# A closed cylindrical tank contains 20*(pi) cubic feet of

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A closed cylindrical tank contains 20*(pi) cubic feet of  [#permalink]

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15 Feb 2012, 08:08
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Difficulty:

55% (hard)

Question Stats:

66% (02:04) correct 34% (02:37) wrong based on 150 sessions

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A closed cylindrical tank contains 20*(pi) cubic feet of water and is filled to half its capacity. When the tank is placed upright on its circular base on level ground, the height of the water in the tank is 5 feet. When the tank is placed on its side on level ground, what is the height, in feet, of the surface of the water above the ground?
(Note: "pi" is the constant to calculate the area in a circle. Does someone know its code in the keyboard?)

(A) 1
(B) 1.5
(C) 2
(D) 2.5
(E) 3

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Re: Beautiful question - Just common sense!  [#permalink]

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15 Feb 2012, 08:21
1

Half the capacity $$=20{\pi}$$ cubic feet
So Full Capacity $$=40{\pi}$$ cubic feet

Half the Length $$=5$$ feet
So Full Length $$=10$$ feet

Volume of Cylinder $$={\pi}r^2h$$
$$h=10$$
So $${\pi}r^2h=40{\pi}$$
So $${\pi}r^2*(10)=40{\pi}$$
So $$r^2=4$$
So $$r=2$$

Lying on the ground, water should be half the way up the cylinder, since the cylinder is half full so technically it is as high above the ground as the radius which is $$2$$

Hence C
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Re: A closed cylindrical tank contains 20*(pi) cubic feet of  [#permalink]

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15 Feb 2012, 09:26
1
metallicafan wrote:
A closed cylindrical tank contains 20*(pi) cubic feet of water and is filled to half its capacity. When the tank is placed upright on its circular base on level ground, the height of the water in the tank is 5 feet. When the tank is placed on its side on level ground, what is the height, in feet, of the surface of the water above the ground?
(Note: "pi" is the constant to calculate the area in a circle. Does someone know its code in the keyboard?)

(A) 1
(B) 1.5
(C) 2
(D) 2.5
(E) 3

Enjoy it, just as I did

Source: Jeff Sackmann problems - http://www.gmathacks.com

Since the tank is half full when placed upright then it will also be half full when placed on its side, so the level of the water will be half of the diameter, so r.

Now, given that $$V_{water}=\pi{*r^2}*H_{water}$$ --> $$20\pi=\pi{r^2}*5$$ --> $$r=2$$.

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Re: A closed cylindrical tank contains 20*(pi) cubic feet of  [#permalink]

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05 Mar 2017, 21:59
metallicafan wrote:
A closed cylindrical tank contains 20*(pi) cubic feet of water and is filled to half its capacity. When the tank is placed upright on its circular base on level ground, the height of the water in the tank is 5 feet. When the tank is placed on its side on level ground, what is the height, in feet, of the surface of the water above the ground?
(Note: "pi" is the constant to calculate the area in a circle. Does someone know its code in the keyboard?)

(A) 1
(B) 1.5
(C) 2
(D) 2.5
(E) 3

Enjoy it as much as I did

Source: Jeff Sackmann problems - http://www.gmathacks.com

Alt + 227 is the code for Pi.
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Re: A closed cylindrical tank contains 20*(pi) cubic feet of  [#permalink]

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21 Sep 2018, 06:23
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: A closed cylindrical tank contains 20*(pi) cubic feet of &nbs [#permalink] 21 Sep 2018, 06:23
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