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If two copying machines work simultaneously at their [#permalink]
08 Sep 2009, 11:35

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E

Difficulty:

35% (medium)

Question Stats:

57% (01:23) correct
43% (00:20) wrong based on 57 sessions

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 [#permalink]
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 [#permalink]
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]
03 Jan 2012, 10:57

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

gmatclubot

Re: If two copying machines work simultaneously at their
[#permalink]
03 Jan 2012, 10:57

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