Find all School-related info fast with the new School-Specific MBA Forum

It is currently 21 Sep 2014, 04:17

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Machines X and Y produced identical bottles

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 29 Jan 2011
Posts: 386
Followers: 0

Kudos [?]: 37 [0], given: 87

GMAT Tests User
Machines X and Y produced identical bottles [#permalink] New post 02 Jul 2011, 23:53
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

67% (02:26) correct 33% (00:58) wrong based on 6 sessions
Please explain in detail? If anyone has studied from Manhattan . Can you please solve using their method?

Machines X and Y produced identical bottles at different constant rates. Machine X, operating alone for 4 hours, filled part of a production lot; then machine Y, operating alone for 3 hours, filled the rest of this lot. How many hours would it have taken machine X operating alone to fill the entire production lot?
(1) Machine X produced 30 bottles per minute.
(2) Machine X produced twice as many bottles in 4 hours as machine Y produced in 3 hours.
[Reveal] Spoiler: OA
Current Student
avatar
Joined: 26 May 2005
Posts: 571
Followers: 18

Kudos [?]: 111 [0], given: 13

GMAT Tests User
Re: Machines X and Y produced identical bottles [#permalink] New post 03 Jul 2011, 04:34
siddhans wrote:
Please explain in detail? If anyone has studied from Manhattan . Can you please solve using their method?

Machines X and Y produced identical bottles at different constant rates. Machine X, operating alone for 4 hours, filled part of a production lot; then machine Y, operating alone for 3 hours, filled the rest of this lot. How many hours would it have taken machine X operating alone to fill the entire production lot?
(1) Machine X produced 30 bottles per minute.
(2) Machine X produced twice as many bottles in 4 hours as machine Y produced in 3 hours.


U can plug in the values using option B .
Attachments

RTW.jpg
RTW.jpg [ 32.56 KiB | Viewed 1145 times ]

Manager
Manager
User avatar
Joined: 29 Jun 2011
Posts: 76
Followers: 3

Kudos [?]: 11 [0], given: 47

Re: Machines X and Y produced identical bottles [#permalink] New post 03 Jul 2011, 04:39
so we have here Total Work Done = 4X+3Y ie 4 hours of X rate + 3 hours of Y rate
let the net rate be r. so 7 hours of r = 4x+3y
ie 7r=4x+3y

now statement 1 : gives me rate of x...it is not sufficient since it doesnt say anything about y
statement 2 : 4 hours of x = 3 hours of y
ie 4x=3y
substituting in original equation we get => 7r =8x or x=(7/8)r

now 7 hours of r -----> full work
p hours of x -----> full work

therefore 7r = px but x=(7/8)r
so, 7r = 7/8 * r * p
or p = 8 hours...so the statement is sufficient.

Ans B
_________________

It matters not how strait the gate,
How charged with punishments the scroll,
I am the master of my fate :
I am the captain of my soul.
~ William Ernest Henley

2 KUDOS received
Senior Manager
Senior Manager
User avatar
Joined: 03 Mar 2010
Posts: 446
Schools: Kelley,Tepper,Carlson,Kenan Flager,Broad
Followers: 4

Kudos [?]: 114 [2] , given: 22

GMAT Tests User
Re: Machines X and Y produced identical bottles [#permalink] New post 03 Jul 2011, 10:15
2
This post received
KUDOS
fivedaysleft wrote:
statement 2 : 4 hours of x = 2( 3 hours of y)


Shouldn't it be twice?

Let the rate of m/c X be x bottles/hour
Let the rate of m/c Y be y bottles/hour

So in 4 hours m/c X will produce = 4x bottles
and in 3 hours m/c Y will produce = 3y bottles.
Total bottles = 4x+3y ----(1)

Stmt1: Machine X produced 30 bottles per minute. i.e x=30bottles/min but rate of y is not given. Insufficient.

Stmt2: Machine X produced twice as many bottles in 4 hours as machine Y produced in 3 hours.

4x = 2 * 3y
y=2/3 x
Substituting in (1), 4x+ 3 * 2/3 x = 6x total number of bottles.

Now rate of m/c X is x bottles in 1 hour
so 6x bottles in 6 hours.

OA B.
_________________

My dad once said to me: Son, nothing succeeds like success.

Manager
Manager
User avatar
Joined: 29 Jun 2011
Posts: 76
Followers: 3

Kudos [?]: 11 [0], given: 47

Re: Machines X and Y produced identical bottles [#permalink] New post 03 Jul 2011, 10:21
yeah...my bad...but since it DS...it didnt do THAT much harm...the concept is fine though right?

any other mistake, kindly point out!
_________________

It matters not how strait the gate,
How charged with punishments the scroll,
I am the master of my fate :
I am the captain of my soul.
~ William Ernest Henley

Re: Machines X and Y produced identical bottles   [#permalink] 03 Jul 2011, 10:21
    Similar topics Author Replies Last post
Similar
Topics:
Machines X and Y produce identical bottles at different galaxyblue 3 08 Nov 2011, 19:21
Experts publish their posts in the topic Machines X and Y produced identical bottles at different sonibubu 8 28 Jan 2008, 12:38
1 Machines X and Y produced identical bottles at different GGUY 5 17 Jan 2008, 06:39
Machines X and Y produced identical bottles at different Hermione 8 23 Oct 2006, 00:21
Machines X and Y produced identical bottles at different joemama142000 4 24 Nov 2005, 21:27
Display posts from previous: Sort by

Machines X and Y produced identical bottles

  Question banks Downloads My Bookmarks Reviews Important topics  


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

Powered by phpBB © phpBB Group and phpBB SEO

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®.