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# If two copying machines work simultaneously at their

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Manager
Joined: 06 Apr 2010
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If two copying machines work simultaneously at their  [#permalink]

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08 Sep 2010, 11:40
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25% (medium)

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65% (00:50) correct 35% (00:52) wrong based on 342 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.
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08 Sep 2010, 12:05
1
udaymathapati 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. obviously INSUFF since you know nothing about the other machine.
2. INSUFF since you dont know the rate - it could be 10/min or 20/min so end result differs

Combine:
M1 = 250/min
M2 COULD be 500/min OR 125/min since M1 could be the machine that produces 250/min AND the same machine that is twice the rate from 2. so as you can see the end result differrs.

E
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08 Sep 2010, 13:14
udaymathapati 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.

To answer this question I need to know the rates of both the machines. Without that it is not possible to answer the question
St 1: Only gives me one rate
st 2: Just gives me a relation

1+ 2 = Cannot give me anything since I donot know if 250 c/min is the rate of the faster or the slower machine.

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

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Updated on: 27 Feb 2012, 04:47
2
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.

Originally posted by RadhaKrishnan on 28 Jan 2012, 04:01.
Last edited by Bunuel on 27 Feb 2012, 04:47, edited 2 times in total.
Added the OA and moved to DS subforum.
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28 Jan 2012, 04:13
2
2
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.

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.

P.S. Please post PS questions in the PS subforum: gmat-problem-solving-ps-140/ and DS questions in the DS subforum: gmat-data-sufficiency-ds-141/
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Re: If two copying machines work simultaneously at their  [#permalink]

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04 Oct 2014, 10:08
Fell for the trap , one of the machines could mean either !!
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Re: If two copying machines work simultaneously at their  [#permalink]

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26 Jul 2016, 00:52
very tricky and good question,

1) insuff .dont have info about 2nd machine
2) insuff again.dont have value for either machine's rate.

1+2, a bit tricky,

two cases :
1) 1st machine =250 ,2nd machine=500
2)1st machine =250, 2nd machine=125

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

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09 Oct 2019, 13:13
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] 09 Oct 2019, 13:13
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