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How many minutes would it take Guy to complete 15X2 phone calls at a c

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How many minutes would it take Guy to complete 15X2 phone calls at a c [#permalink]

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New post Updated on: 18 May 2015, 04:41
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Question Stats:

47% (01:09) correct 53% (01:13) wrong based on 276 sessions

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How many minutes would it take Guy to complete 15X2 phone calls at a constant rate?

(1) Guy takes X minutes to complete each phone call.
(2) Every minute, Guy completes X phone calls.
[Reveal] Spoiler: OA

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Originally posted by reto on 15 May 2015, 07:19.
Last edited by Bunuel on 18 May 2015, 04:41, edited 1 time in total.
Edited the question.
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Re: How many minutes would it take Guy to complete 15X2 phone calls at a c [#permalink]

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New post 17 May 2015, 18:58
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Here the answer lies in the fact that those 2 statements together mean that X must be 1. If he completes x phones calls/minute AND takes x minutes to complete each phone call, the only possible value for X is 1. Knowing that, the question is asking us how long it takes him to complete 1,512 phone calls, if he completes 1 phone call each minute. Therefore together they are sufficient (it will take him 1,512 minutes), and the answer choice is C.

I hope this helps!
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Re: How many minutes would it take Guy to complete 15X2 phone calls at a c [#permalink]

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It took me some time to understand why each statement alone is not sufficient. But to be honest i don't like this question. Moreover, i couldn't understand at first what is "15X2". Quite ambiguous.
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Re: How many minutes would it take Guy to complete 15X2 phone calls at a c [#permalink]

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New post 06 Jun 2015, 00:58
Konstantin1983 wrote:
It took me some time to understand why each statement alone is not sufficient. But to be honest i don't like this question. Moreover, i couldn't understand at first what is "15X2". Quite ambiguous.


Try plugging in random numbers in place of "15X2", in each case your answer will still be 1. As far as the question is concerned, I share your sentiments.
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How many minutes would it take Guy to complete 15X2 phone calls at a c [#permalink]

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New post 19 Sep 2015, 15:48
I agree, understanding what 15X2 means was confusing, and the first statement one minutes isn't grammatically correct. Perhaps if variable was further defined in the question stem with "if x is an integer" then it might have helped in what was being asked. I was trying to decide if it were an operator or an integer.. Anyhow, good mental exercise nonetheless

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Re: How many minutes would it take Guy to complete 15X2 phone calls at a c [#permalink]

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New post 31 Dec 2017, 10:30
To be fiar you'd a get D too not just C.
x min --> 1 call
15x2 --> 15X2*1/X = 30

Same for statement 2.
would be glad to know the error in reasoning here.
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Re: How many minutes would it take Guy to complete 15X2 phone calls at a c [#permalink]

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New post 31 Dec 2017, 10:35
Madhavi1990 wrote:
To be fiar you'd a get D too not just C.
x min --> 1 call
15x2 --> 15X2*1/X = 30

Same for statement 2.
would be glad to know the error in reasoning here.


Hi Madhavi1990

Statement 2 says that every Minute the guy completes X calls. So in 1 minute I can make more than 1 call so X>=1. for eg. I can make 2 calls of 30 secs each. Hence B will not be the answer
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Re: How many minutes would it take Guy to complete 15X2 phone calls at a c [#permalink]

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New post 31 Dec 2017, 10:40
niks18 wrote:
Madhavi1990 wrote:
To be fiar you'd a get D too not just C.
x min --> 1 call
15x2 --> 15X2*1/X = 30

Same for statement 2.
would be glad to know the error in reasoning here.


Hi Madhavi1990

Statement 2 says that every Minute the guy completes X calls. So in 1 minute I can make more than 1 call so X>=1. for eg. I can make 2 calls of 30 secs each. Hence B will not be the answer



Thank you, I saw my error :) Have to read carefully
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Re: How many minutes would it take Guy to complete 15X2 phone calls at a c [#permalink]

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New post 18 Jan 2018, 19:31
Konstantin1983 wrote:
It took me some time to understand why each statement alone is not sufficient. But to be honest i don't like this question. Moreover, i couldn't understand at first what is "15X2". Quite ambiguous.



I understood it as 15X2 = 30 and was wondering it could be written as 30....
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Re: How many minutes would it take Guy to complete 15X2 phone calls at a c [#permalink]

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New post 18 Jan 2018, 23:07
Kezia9 wrote:
Konstantin1983 wrote:
It took me some time to understand why each statement alone is not sufficient. But to be honest i don't like this question. Moreover, i couldn't understand at first what is "15X2". Quite ambiguous.



I understood it as 15X2 = 30 and was wondering it could be written as 30....


Hi

GMAT questions will not have ambiguity. If the intention of the question is to give you 30, they will NOT write it as 15X2 or even 15*2, it will be clearly mentioned. While I agree this question is slightly ambiguous, GMAT will take care of this. GMAT questions will try to trap us using means such as close options, common mistakes, incorrect comprehension, but NOT using ambiguity or misleading information
Re: How many minutes would it take Guy to complete 15X2 phone calls at a c   [#permalink] 18 Jan 2018, 23:07
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