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

 It is currently 22 Aug 2019, 04:38

### 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

# Elvin's monthly telephone bill is the sum of the charge for the calls

Author Message
TAGS:

### Hide Tags

Retired Moderator
Joined: 06 Jul 2014
Posts: 1221
Location: Ukraine
Concentration: Entrepreneurship, Technology
GMAT 1: 660 Q48 V33
GMAT 2: 740 Q50 V40
Elvin's monthly telephone bill is the sum of the charge for the calls  [#permalink]

### Show Tags

18 Jun 2015, 09:17
1
3
00:00

Difficulty:

5% (low)

Question Stats:

86% (01:29) correct 14% (01:59) wrong based on 78 sessions

### HideShow timer Statistics

Elvin's monthly telephone bill is the sum of the charge for the calls he made during the month and a fixed monthly charge for Internet service. Elvin's total telephone bill for January was \$48 and Elvin's total telephone bill for February was 76\$. If Elvin's charge for the calls he made in February was twice the charge for the calls he made in January, what is Elvin's fixed monthly charge for Internet service?

A) \$5
B) \$10
C) \$14
D) \$20
E) \$28

_________________
CEO
Status: GMATINSIGHT Tutor
Joined: 08 Jul 2010
Posts: 2967
Location: India
GMAT: INSIGHT
Schools: Darden '21
WE: Education (Education)
Elvin's monthly telephone bill is the sum of the charge for the calls  [#permalink]

### Show Tags

18 Jun 2015, 09:55
Harley1980 wrote:
Elvin's monthly telephone bill is the sum of the charge for the calls he made during the month and a fixed monthly charge for Internet service. Elvin's total telephone bill for January was \$48 and Elvin's total telephone bill for February was 76\$. If Elvin's charge for the calls he made in February was twice the charge for the calls he made in January, what is Elvin's fixed monthly charge for Internet service?

A) \$5
B) \$10
C) \$14
D) \$20
E) \$28

Bill = Fixed Charge + Charge of Calls made

in Jan, Bill = Fixed Charge(Let, y) + Charge of calls made in Jan (Let, x) = \$48
in Feb, Bill = Fixed Charge (Let, y) + Charge of calls made in Feb (Then, 2x) = \$76

i.e. x+y = 48
and 2x+y = 76

Take the difference if two equations

i.e. (2x+y) - (x+y) = 76 - 48
i.e. x = 28
i.e. Fixed Monthly Charge, y = 20

_________________
Prosper!!!
GMATinsight
Bhoopendra Singh and Dr.Sushma Jha
e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772
Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi
http://www.GMATinsight.com/testimonials.html

ACCESS FREE GMAT TESTS HERE:22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION
GMAT Tutor
Joined: 24 Jun 2008
Posts: 1818
Re: Elvin's monthly telephone bill is the sum of the charge for the calls  [#permalink]

### Show Tags

18 Jun 2015, 11:09
1
When you double a number, you are just increasing it by itself, because 2x and x+x are the same thing.

So in this question, his bill increases by 76 - 48 = 28 dollars from Jan to Feb because the phone part of the bill doubled. Since the increase was \$28, the original phone bill must have been \$28, and the rest, or \$20, was the internet bill.
_________________
GMAT Tutor in Toronto

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com
Non-Human User
Joined: 09 Sep 2013
Posts: 12066
Re: Elvin's monthly telephone bill is the sum of the charge for the calls  [#permalink]

### Show Tags

05 Aug 2019, 20:35
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: Elvin's monthly telephone bill is the sum of the charge for the calls   [#permalink] 05 Aug 2019, 20:35
Display posts from previous: Sort by