GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 07 Dec 2019, 01:50

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

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

Author Message
TAGS:

### Hide Tags

Manager
Joined: 13 Jul 2010
Posts: 100
A telephone company charges x cents for the first minute of a call and  [#permalink]

### Show Tags

21 Nov 2010, 20:46
1
1
00:00

Difficulty:

35% (medium)

Question Stats:

69% (01:45) correct 31% (01:31) wrong based on 45 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) $$\frac{555}{x+ y}$$ Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 9850 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
_________________
Karishma
Veritas Prep GMAT Instructor

Manager
Joined: 25 Aug 2008
Posts: 137
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
1
Thanks Karishma..
Even i was caught in the trap of answer A.
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 9850
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

Target Test Prep Representative
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 8622
Location: United States (CA)
Re: A telephone company charges x cents for the first minute of a call and  [#permalink]

### Show Tags

06 Mar 2018, 08:04
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) $$\frac{555 - x}{y}$$ (B) $$\frac{555+x- y}{y}$$ (C) $$\frac{555-x+ y}{y}$$ (D) $$\frac{555-x- y}{y}$$ (E) $$\frac{555}{x+ y}$$ Since x and y are in cents, we should start by expressing$5.55 in cents, which is 555 cents. We can then create the following equation where t = the length of the call, in minutes:

555 = x + y(t - 1)

555 - x = yt - y

555 - x + y = yt

(555 - x + y)/y = t

_________________

# Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

Non-Human User
Joined: 09 Sep 2013
Posts: 13722
Re: A telephone company charges x cents for the first minute of a call and  [#permalink]

### Show Tags

29 Aug 2019, 15:23
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: A telephone company charges x cents for the first minute of a call and   [#permalink] 29 Aug 2019, 15:23
Display posts from previous: Sort by