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# cost of a call

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Manager
Joined: 13 Jul 2010
Posts: 168
Followers: 1

Kudos [?]: 88 [0], given: 7

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21 Nov 2010, 20:46
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(N/A)

Question Stats:

50% (01:58) correct 50% (01:26) wrong based on 5 sessions

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A telephone company charges x cents for the first
minute of a call and charges for any additional time
at the rate of y cents per minute. If a certain call
costs $5.55 and lasts more than 1 minute, which of the following expressions represents the length of that call, in minutes? (A) $$555 - x / y$$ (B) $$555+x- y/y$$ (C) $$555-x+ y/y$$ (D) $$555-x- y/y$$ (E) $$555/x+ y$$ Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 7382 Location: Pune, India Followers: 2293 Kudos [?]: 15173 [0], given: 224 Re: cost of a call [#permalink] ### Show Tags 21 Nov 2010, 21:10 gettinit wrote: A telephone company charges x cents for the first minute of a call and charges for any additional time at the rate of y cents per minute. If a certain call costs$5.55 and lasts more than 1 minute, which of
the following expressions represents the length of
that call, in minutes?
(A) $$555 - x / y$$
(B) $$555+x- y/y$$
(C) $$555-x+ y/y$$
(D) $$555-x- y/y$$
(E) $$555/x+ y$$

Let us say the call lasts for n minutes.
Cost of first minute = x
Cost of next (n - 1) minutes = y(n - 1)
Then, x + y(n - 1) = 555
n = (555-x)/y + 1 = (555 - x + y)/y
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for $199 Veritas Prep Reviews Manager Joined: 13 Jul 2010 Posts: 168 Followers: 1 Kudos [?]: 88 [0], given: 7 Re: cost of a call [#permalink] ### Show Tags 22 Nov 2010, 21:01 Thanks Karishma should have known the trap answer here was A, and used Algebra to solve. Intern Joined: 10 Oct 2010 Posts: 35 Followers: 0 Kudos [?]: 1 [0], given: 3 Re: cost of a call [#permalink] ### Show Tags 26 Nov 2010, 16:34 On the test wold they put the options in parentheses? Manager Joined: 13 Jul 2010 Posts: 168 Followers: 1 Kudos [?]: 88 [0], given: 7 Re: cost of a call [#permalink] ### Show Tags 26 Nov 2010, 16:42 Wofford wrote: On the test wold they put the options in parentheses? I think they will. They cannot make answer choices ambiguous because they want to make sure you answer correctly or incorrectly based on your knowledge not because answer choices were not clear. Manager Joined: 25 Aug 2008 Posts: 224 Location: India WE 1: 3.75 IT WE 2: 1.0 IT Followers: 2 Kudos [?]: 64 [0], given: 5 Re: cost of a call [#permalink] ### Show Tags 26 Nov 2010, 16:51 Thanks Karishma.. Even i was caught in the trap of answer A. _________________ Cheers, Varun If you like my post, give me KUDOS!! Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 7382 Location: Pune, India Followers: 2293 Kudos [?]: 15173 [0], given: 224 Re: cost of a call [#permalink] ### Show Tags 26 Nov 2010, 19:59 varunmaheshwari wrote: Thanks Karishma.. Even i was caught in the trap of answer A. I am always cautious while marking (A) as my answer. Not because the probability of it being the answer is low, but because if the question has a trap people could fall for, then the question maker will set (A) as that particular lucrative option. (Hell, I do that when I make questions! Kind of a bait!) So I like to double check especially if it seems too easy. The logic of (555 - x)/y was perfectly valid. The only missing point was that these are the (n -1) additional minutes. You did not account for the 1st minute. So total time will be (555 - x)/y + 1 which is the same as option (C): (555 - x + y)/y And yes, parentheses will definitely be there in the exam in such a question. 555 - x + y/y = 555 - x + 1 (Since it didn't make any sense here, it was obvious that there are parentheses in the options). Rest assured, there will not be any ambiguity in the actual exam. _________________ Karishma Veritas Prep | GMAT Instructor My Blog Get started with Veritas Prep GMAT On Demand for$199

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Re: cost of a call   [#permalink] 26 Nov 2010, 19:59
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