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.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

If two copying machines work simultaneously at their [#permalink]

Show Tags

08 Sep 2009, 11:35

17

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

35% (medium)

Question Stats:

55% (01:39) correct
45% (00:35) wrong based on 470 sessions

HideShow timer Statistics

If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes?

(1) One of the machines produces copies at the constant rate of 250 copies per minute. (2) One of the machines produces copies at twice the constant rate of the other machine.

Re: If two copying machines work simultaneously at their [#permalink]

Show Tags

08 Sep 2009, 12:19

Ok I understand, we don't know which machine is which, I mean, the machine that produces 250 could be the same which produces twice the other machine.
_________________

Re: If two copying machines work simultaneously at their [#permalink]

Show Tags

19 Sep 2009, 11:57

If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes? (1) One of the machines produces copies at the constant rate of 250 copies per minute. (2) One of the machines produces copies at twice the constant rate of the other machine.

IMO E....let's say two machines A and B

1. A = 250/minute no relation between A and B => NS 2. A=2B or B=2A => NS

Re: If two copying machines work simultaneously at their [#permalink]

Show Tags

03 Jan 2012, 10:57

2

This post received KUDOS

Excellent question. 1. Clearly insufficient 2. No rate of one of the machines specified, so insufficient

Together, the two machines could be: a. 250 cpm, 125 cpm b. 250 cpm, 500 cpm insufficient

So, E.
_________________

I am the master of my fate. I am the captain of my soul. Please consider giving +1 Kudos if deserved!

DS - If negative answer only, still sufficient. No need to find exact solution. PS - Always look at the answers first CR - Read the question stem first, hunt for conclusion SC - Meaning first, Grammar second RC - Mentally connect paragraphs as you proceed. Short = 2min, Long = 3-4 min

Re: If two copying machines work simultaneously at their [#permalink]

Show Tags

17 Mar 2015, 11:59

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: If two copying machines work simultaneously at their [#permalink]

Show Tags

13 May 2016, 00:33

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: If two copying machines work simultaneously at their [#permalink]

Show Tags

01 Aug 2016, 02:45

gurpreet07 wrote:

If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes?

(1) One of the machines produces copies at the constant rate of 250 copies per minute. (2) One of the machines produces copies at twice the constant rate of the other machine.

(1) One of the machines produces copies at the constant rate of 250 copies per minute. We don't know the rate of other machine INSUFFICIENT

(2) One of the machines produces copies at twice the constant rate of the other machine The rate of the other machine can be 125 or 250 INSUFFICIENT

Merging both one machine = 250; other machine 125 or 250

INSUFFICIENT

ANSWER is E
_________________

Posting an answer without an explanation is "GOD COMPLEX". The world doesn't need any more gods. Please explain you answers properly. FINAL GOODBYE :- 17th SEPTEMBER 2016.

Re: If two copying machines work simultaneously at their [#permalink]

Show Tags

18 Sep 2016, 20:42

gurpreet07 wrote:

If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes?

(1) One of the machines produces copies at the constant rate of 250 copies per minute. (2) One of the machines produces copies at twice the constant rate of the other machine.

E

1) Don't know the rate of the other machine 2) (x+y)5=? x=2y, (3y)5=? still don't have rate for one of the machine 1+2) You don't know which of the two machine has rate of 250. if x=250, y=250/2. If y=250, x=500. Therefore, you can get two different outputs depending on where you define the rate of 250.

Re: If two copying machines work simultaneously at their [#permalink]

Show Tags

12 Nov 2016, 20:29

1

This post received KUDOS

I got the answer initially wrong as I was in a hurry to finish it under 17 sec LOL. This is where people like me get killed. Anyways coming to the answer A=RT Amount of work A =1 R=(1/R1+1/R2) T= time required.

Statemeent 1: Ofcourse insufficient as only one rate is given Statement 2: Insufficient as only a comparison relationship is given and no numeric values

Ans C is very tempting as basic human tendency of joining dots for our benefit but hey wait. it is said " One machine produces copies twice the other but we don't know which one is producing twice the other M1=250 M2=500 or M1=250 M2= 125??

Understood? There is noway a clear mention of M1<M2 OR m2<m1 and what is the value of either of M1 or M2. So yeah the answer is E.

[quote="gurpreet07"]If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes?

(1) One of the machines produces copies at the constant rate of 250 copies per minute. (2) One of the machines produces copies at twice the constant rate of the other machine.

/quote]

Straight E, though a little bit tricky. All we need to know is the rates of these machines. Though from both statement the rates can be: 250 copies per minute and 500 copies per minute; 250 copies per minute and 125 copies per minute.

Its been long time coming. I have always been passionate about poetry. It’s my way of expressing my feelings and emotions. And i feel a person can convey...

Written by Scottish historian Niall Ferguson , the book is subtitled “A Financial History of the World”. There is also a long documentary of the same name that the...

Post-MBA I became very intrigued by how senior leaders navigated their career progression. It was also at this time that I realized I learned nothing about this during my...