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

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A tank containing water started to leak. Did the tank [#permalink]  23 Feb 2011, 05:12
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20% (00:00) correct 80% (01:16) wrong based on 5 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.
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Re: Water [#permalink]  23 Feb 2011, 07:11
(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]  12 Mar 2011, 19:22
Good question. My answer is E too.
Re: Water   [#permalink] 12 Mar 2011, 19:22
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