GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 20 Sep 2018, 13:32

### 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

# A small pool filled only with water will require an addition

Author Message
TAGS:

### Hide Tags

Senior Manager
Joined: 24 Aug 2009
Posts: 476
Schools: Harvard, Columbia, Stern, Booth, LSB,
A small pool filled only with water will require an addition  [#permalink]

### Show Tags

29 Jul 2013, 00:01
4
00:00

Difficulty:

65% (hard)

Question Stats:

65% (01:30) correct 35% (01:03) wrong based on 327 sessions

### HideShow timer Statistics

A small pool filled only with water will require an additional 300 gallons of water in order to be filled to 80% of its capacity. If pumping in these additional 300 gallons of water will increase the amount of water in the pool by 30%, what is the total capacity of the pool in gallons?

A. 1000
B. 1250
C. 1300
D. 1600
E. 1625

_________________

If you like my Question/Explanation or the contribution, Kindly appreciate by pressing KUDOS.
Kudos always maximizes GMATCLUB worth
-Game Theory

If you have any question regarding my post, kindly pm me or else I won't be able to reply

Math Expert
Joined: 02 Sep 2009
Posts: 49271
Re: A small pool filled only with water will require an addition  [#permalink]

### Show Tags

29 Jul 2013, 00:09
2
3
fameatop wrote:
A small pool filled only with water will require an additional 300 gallons of water in order to be filled to 80% of its capacity. If pumping in these additional 300 gallons of water will increase the amount of water in the pool by 30%, what is the total capacity of the pool in gallons?

A. 1000
B. 1250
C. 1300
D. 1600
E. 1625

Since pumping in additional 300 gallons of water will increase the amount of water in the pool by 30%, then initially the pool is filled with 1,000 gallons of water.

So, we have that 1,000 + 300 = 0.8*{total} --> {total} = 1,625.

Hope it's clear.
_________________
##### General Discussion
Manager
Joined: 28 Feb 2012
Posts: 112
GPA: 3.9
WE: Marketing (Other)
Re: A small pool filled only with water will require an addition  [#permalink]

### Show Tags

30 Jul 2013, 07:33
4
fameatop wrote:
A small pool filled only with water will require an additional 300 gallons of water in order to be filled to 80% of its capacity. If pumping in these additional 300 gallons of water will increase the amount of water in the pool by 30%, what is the total capacity of the pool in gallons?

A. 1000
B. 1250
C. 1300
D. 1600
E. 1625

Difficult one in terms of understanding the wording under exam conditions.

we know that 300 gallons will increase the amount of existing water up to 30%, lets say there are x gallons of water and we add 300 => x+300=1.3x => x=1000
Now we now that 1000 gallons already exist in the tank and we add 300 => 1000+300=1300, which is 80% of the total capacity.
So the total capacity is (1300*100)/80=1625
_________________

If you found my post useful and/or interesting - you are welcome to give kudos!

Senior Manager
Joined: 03 Apr 2013
Posts: 283
Location: India
Concentration: Marketing, Finance
GMAT 1: 740 Q50 V41
GPA: 3
A small pool filled only with water will require an addition  [#permalink]

### Show Tags

11 Jul 2016, 05:57
1
fameatop wrote:
A small pool filled only with water will require an additional 300 gallons of water in order to be filled to 80% of its capacity. If pumping in these additional 300 gallons of water will increase the amount of water in the pool by 30%, what is the total capacity of the pool in gallons?

A. 1000
B. 1250
C. 1300
D. 1600
E. 1625

we know that adding 300 gallons will increase the water currently in the pool by 30%..
Or...the water will become 130% of itself..and we also know that 30% of the water currently in the pool is 300 gallons..

By unitary method..
if 30% --- 300 gallons
then 130% --- $$300 * \frac{130}{100}$$

This is 80% of the total capacity..so the total capacity will be this value multiplied with

$$\frac{100}{80}$$

Thus the total capacity is

$$300 * \frac{130}{100}*\frac{100}{80}$$

Which gives us..? (E)

_________________

Spread some love..Like = +1 Kudos

Director
Joined: 20 Feb 2015
Posts: 733
Concentration: Strategy, General Management
Re: A small pool filled only with water will require an addition  [#permalink]

### Show Tags

14 Jul 2016, 03:14
let the total capacity and initial water level be x and y respectively

now, as per the question

y+300=.8x -----1

y+300=1.3y ----2
.3y=300
y=1000

substitute in equation 1

1300=.8x
x=13000/8 = 1625
Current Student
Joined: 18 Oct 2014
Posts: 874
Location: United States
GMAT 1: 660 Q49 V31
GPA: 3.98
Re: A small pool filled only with water will require an addition  [#permalink]

### Show Tags

14 Jul 2016, 04:21
fameatop wrote:
A small pool filled only with water will require an additional 300 gallons of water in order to be filled to 80% of its capacity. If pumping in these additional 300 gallons of water will increase the amount of water in the pool by 30%, what is the total capacity of the pool in gallons?

A. 1000
B. 1250
C. 1300
D. 1600
E. 1625

300 gallons of water increases capacity by 30% that means

30% is 300 gallons, so 100% would be = 300*100/30= 1000 gallons

Now 1000 +300 gallons is 80% capacity of tank.

so 100% capacity would be= 1300 *100/80= 1625

_________________

I welcome critical analysis of my post!! That will help me reach 700+

Non-Human User
Joined: 09 Sep 2013
Posts: 8105
Re: A small pool filled only with water will require an addition  [#permalink]

### Show Tags

01 Nov 2017, 17:41
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).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: A small pool filled only with water will require an addition &nbs [#permalink] 01 Nov 2017, 17:41
Display posts from previous: Sort by

# Events & Promotions

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.