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

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08 Sep 2009, 12:35

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A

B

C

D

E

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57% (00:39) correct
43% (00:34) wrong based on 545 sessions

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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]

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08 Sep 2009, 13:19

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

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19 Sep 2009, 12:57

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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]

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03 Jan 2012, 11:57

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

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17 Mar 2015, 12:59

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

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13 May 2016, 01:33

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).

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

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01 Aug 2016, 03:45

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

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18 Sep 2016, 21:42

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]

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12 Nov 2016, 21:29

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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.

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