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

It is currently 26 May 2019, 20:42

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Two water tanks, X and Y, were drained simultaneously. If X

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Joined: 03 Sep 2005
Posts: 123
Two water tanks, X and Y, were drained simultaneously. If X  [#permalink]

Show Tags

New post 17 Sep 2005, 02:02
1
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

HideShow timer Statistics

Two water tanks, X and Y, were drained simultaneously. If X contained 30 more gallons of water than Y, and both tanks became empty at the same time, how long did it take the tanks to empty?

1) For ever gallon drained from tank Y, 2 gallons were drained from tank X.

2) Tank Y was drained at a constant rate of 20 gallons per hour.

Like they used to say in math class, please show your work! OA to come!

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.


If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________
Life is not measured by the number of breaths you take, but by the number of moments that take your breath away.
Senior Manager
Senior Manager
avatar
Joined: 22 Jun 2005
Posts: 332
Location: London
  [#permalink]

Show Tags

New post 17 Sep 2005, 04:28
I would pick C.


Let G be the volume in Y, which means we have G+30 in container X.

1) For ever gallon drained from tank Y, 2 gallons were drained from tank X.
Insufficient, need the rates.

2) Tank Y was drained at a constant rate of 20 gallons per hour.
Insuff, we need the rate for X.

1, 2 combined yields, the rate of Y is 20 gallon/hour
and the rate of X is 40gallon/hour

So,
The time it takes is the same for both to get empty.

G/20 =(G+30)/40 -> G=30

The time can now be calculated. 30/20=60/40=1.5 hour.
Current Student
avatar
Joined: 28 Dec 2004
Posts: 3156
Location: New York City
Schools: Wharton'11 HBS'12
  [#permalink]

Show Tags

New post 17 Sep 2005, 09:26
lets see..

X=y+30
y

so lets right the Workdone=Rate*time

y+30=rx*t

y=ry*t; where t is the same

(1) tells that rx=2ry

so

y+30=2ry*t
y=ry*t

solve simeltaneously...
30=ry*t

t=30/ry...we dont know ry...insuff

(2)
just tells ry...nothing else...insuff, we need to know the reltavitiy of y and x...

Combine...sufficient...
Senior Manager
Senior Manager
avatar
Joined: 04 May 2005
Posts: 254
Location: CA, USA
  [#permalink]

Show Tags

New post 17 Sep 2005, 10:08
1) For ever gallon drained from tank Y, 2 gallons were drained from tank X.

2) Tank Y was drained at a constant rate of 20 gallons per hour.

from 1+2), we get Y drains at 20g/hr, X drains at 40g/hr
X drains 20g/hr faster

30 gallons more were drained from X, it takes 30/20 = 1.5 hours

so C
Manager
Manager
avatar
Joined: 15 Aug 2005
Posts: 240
Location: Las Vegas, NV
  [#permalink]

Show Tags

New post 17 Sep 2005, 10:44
Got C as well.

Y = amount of water in Y
Y + 30 = amount of water in X

T = time for both to drain

Ry = rate of Y

Rx = rate of X

From Statement one you get

Rx = 2Ry

Set up the rate equations for both (Rate = amount/time), combine and you get

RyT = 30

Insufficient

From Statement two you just get the Ry, also insufficient.

Combine and you get T.

C.
Manager
Manager
avatar
Joined: 03 Sep 2005
Posts: 123
  [#permalink]

Show Tags

New post 17 Sep 2005, 16:22
Good job you guys!! OA is C. You guys are hella smart!
_________________
Life is not measured by the number of breaths you take, but by the number of moments that take your breath away.
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 11029
Re: Two water tanks, X and Y, were drained simultaneously. If X  [#permalink]

Show Tags

New post 02 Sep 2017, 03:04
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.

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.


If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________
GMAT Club Bot
Re: Two water tanks, X and Y, were drained simultaneously. If X   [#permalink] 02 Sep 2017, 03:04
Display posts from previous: Sort by

Two water tanks, X and Y, were drained simultaneously. If X

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

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®.