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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.

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

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04 Jun 2015, 14:36

1

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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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05 Jun 2015, 23:58

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.

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

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19 Sep 2015, 14:48

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

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

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