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# A telephone company charges x cents for the first minute of a call and

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Joined: 13 Jul 2010
Posts: 164

Kudos [?]: 97 [0], given: 7

A telephone company charges x cents for the first minute of a call and [#permalink]

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21 Nov 2010, 20:46
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Question Stats:

50% (00:58) correct 50% (01:26) wrong based on 5 sessions

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) $$\frac{555 - x}{y}$$ (B) $$\frac{555+x- y}{y}$$ (C) $$\frac{555-x+ y}{y}$$ (D) $$\frac{555-x- y}{y}$$ (E) $$\frac{555}{x+ y}$$ [Reveal] Spoiler: OA Kudos [?]: 97 [0], given: 7 Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 7674 Kudos [?]: 17349 [0], given: 232 Location: Pune, India Re: A telephone company charges x cents for the first minute of a call and [#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
Answer (C).
_________________

Karishma
Veritas Prep | GMAT Instructor
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Get started with Veritas Prep GMAT On Demand for $199 Veritas Prep Reviews Kudos [?]: 17349 [0], given: 232 Manager Joined: 25 Aug 2008 Posts: 217 Kudos [?]: 76 [0], given: 5 Location: India WE 1: 3.75 IT WE 2: 1.0 IT Re: A telephone company charges x cents for the first minute of a call and [#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!! Kudos [?]: 76 [0], given: 5 Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 7674 Kudos [?]: 17349 [0], given: 232 Location: Pune, India Re: A telephone company charges x cents for the first minute of a call and [#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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Kudos [?]: 17349 [0], given: 232

Re: A telephone company charges x cents for the first minute of a call and   [#permalink] 26 Nov 2010, 19:59
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# A telephone company charges x cents for the first minute of a call and

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