A tank containing water started to leak. Did the tank contai : GMAT Data Sufficiency (DS)
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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]

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23 Feb 2011, 04:12
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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.
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23 Feb 2011, 06:11
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(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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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]

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12 Jan 2014, 06:12
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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 contai [#permalink]

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01 Dec 2015, 18:10
oh damn...I thought 1 gallon = 1280 oz...dumb me..
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Re: A tank containing water started to leak. Did the tank contai [#permalink]

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31 Mar 2016, 17:33
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Baten80 wrote:
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.

ok...30gallons * 128 = 1280x3 = 3840 ounces
the question is - did the tank contain more than 3840 ounces when it started to leak?

1. we know the rate of the leakage..but we do not know for how long it leaked..
2. tells that time is less than 12 hours..but we do not know the rate of the leakage..+ we do not know the exact time..

1+2.
6.4/min = 64*6=384 ounces/hour
if the tank leaked for > 10 hours, then it contained more than 30 gallons
if the tank leaked for less than 10 hours, then it contained fewer than 30 gallons.

since 2 alone tells that it is less than 12 hours..it can be either 11 or 9. 11-> over 30 gallons and 9-> less than 30 gallons.

E
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Re: A tank containing water started to leak. Did the tank contai [#permalink]

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02 Apr 2016, 11:44
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.

Individually statements are not sufficient.
lets t is the time taken to drain out completely as per statement 2. (t<12). X be the no of gallons.
from both the statements 6.4 = 128x/t*60
solving x=3t (t <12). So we can not get any single value.

Hence E
Re: A tank containing water started to leak. Did the tank contai   [#permalink] 02 Apr 2016, 11:44
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