A certain tank is exactly one quarter full of water. At noon : Quant Question Archive [LOCKED]
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 21 Jan 2017, 09:01

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# A certain tank is exactly one quarter full of water. At noon

Author Message
Manager
Joined: 25 Feb 2008
Posts: 53
Followers: 0

Kudos [?]: 14 [0], given: 0

A certain tank is exactly one quarter full of water. At noon [#permalink]

### Show Tags

21 Mar 2008, 05:13
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A certain tank is exactly one quarter full of water. At noon a valve is opened allowing water to pour into the tank at the rate of 90 gallons an hour. Half an hour later, the tank is exactly one third full. How many gallons of water does the tank hold when it is completely full?
375
410
450
510
540
Optional: time you spend on this question
Manager
Joined: 20 Aug 2007
Posts: 65
Followers: 1

Kudos [?]: 14 [0], given: 0

### Show Tags

21 Mar 2008, 05:57
Capthan wrote:
A certain tank is exactly one quarter full of water. At noon a valve is opened allowing water to pour into the tank at the rate of 90 gallons an hour. Half an hour later, the tank is exactly one third full. How many gallons of water does the tank hold when it is completely full?
375
410
450
510
540
Optional: time you spend on this question

Let full capacity = X
(X/4) + 45 = (X/3)
3X + 540 = 4X
X = 540
Manager
Joined: 28 Sep 2007
Posts: 213
Followers: 1

Kudos [?]: 17 [0], given: 0

### Show Tags

21 Mar 2008, 07:06
It would be 540.

1/3-1/4=1/12=amount filled up within 30 min.

90 gallons an hour/2 = 45 gallons in 30 min

45x12=540
Manager
Joined: 31 Oct 2007
Posts: 113
Location: Frankfurt, Germany
Followers: 2

Kudos [?]: 61 [0], given: 0

### Show Tags

21 Mar 2008, 07:07
Alternatively, the increase is 1/3 - 1/4 = 1/12
and 1/12th = 45gallons

Therefore 12/12th (or 1) = 45 * 12 = 540

Ans: E
_________________

Jimmy Low, Frankfurt, Germany
Blog: http://mytrainmaster.wordpress.com
GMAT Malaysia: http://gmatmalaysia.blogspot.com

Re: tank of water   [#permalink] 21 Mar 2008, 07:07
Display posts from previous: Sort by