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A tank containing water started to leak. Did the tank contai

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A tank containing water started to leak. Did the tank contai [#permalink] New post 23 Feb 2011, 04:12
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  55% (hard)

Question Stats:

62% (02:15) correct 38% (01:09) wrong based on 68 sessions
A tank containing water started to leak. Did the tank contain more than 30 gallons of water when it started to leak? (Note: 1 gallon = 128 ounces)

(1) The water leaked from the tank at a constant rate of 6.4 ounces per minute.
(2) The tank became empty less than 12 hours after it started to leak.
[Reveal] Spoiler: OA

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Last edited by Bunuel on 12 Jan 2014, 06:18, edited 1 time in total.
Added the OA.
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Re: Water [#permalink] New post 23 Feb 2011, 06:11
(1 alone) Does not tell you anything about the size of the tank. OUT

(2 alone) Does not tell you anything about the rate of leakage. OUT

(1 & 2) Lets do some simple math to begin.

30 gallons = 3840 oz
6.4 oz/min = 384 oz/hr

Ah, nice! 3840 and 384 are easy numbers to work with. It should be pretty clear that...

10 hours to drain => 30 gallons
less than 10 hours to drain => less than 30 gallons
more than 10 hours to drain => more than 30 gallons

However, (2) does not help us out in this category, as the time could be either 1 or 11. OUT

(1 or 2) OUT

(Neither Sufficient) CORRECT
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Re: Water [#permalink] New post 12 Mar 2011, 18:22
Good question. My answer is E too.
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Re: A tank containing water started to leak. Did the tank [#permalink] New post 12 Jan 2014, 06:12
E as well.
1 is clearly not sufficient.
2 Without knowing rate of leakage nothing can be said. - not sufficient.

1+2 at 6.4 ounce per min in 12 hours 36 gallons will be leaked so if tank leaks in 11:59 hrs tank must have > 30 gallons initially. This case yields "yes" answer. but if the tank is empty in 2 hours then tank has 6 gallons which is < 30. This case yields "no" answer. NOT SUFFICIENT.
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Re: A tank containing water started to leak. Did the tank   [#permalink] 12 Jan 2014, 06:12
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A tank containing water started to leak. Did the tank contai

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