BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

GMAT PREP....

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Junior | Next Rank: 30 Posts
Posts: 12
Joined: Tue Apr 29, 2008 8:10 pm
by maya2008 » Sat May 10, 2008 12:08 pm
Hey guys,

This question seems easy but from some reason I couldn't solve it...plz help

A certain phone company offers two plans A and B. Under plan A, the company charges a total of 0.6 for the first 7 min. of each call and $0.06 per minute thereafter. Under plan B the company charges $0.08 per minute of each call. what is the duration of call, in minutes, for which the company charges the same amount under plan A and under plan B?

I got this equation:
0.6*7 + (x-7)*0.06 = 0.08*x

that is probably a mistake....right?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
GMAT Instructor
Posts: 189
Joined: Thu May 01, 2008 10:55 pmFollowed by: 1 member
Location: Seattle, WA
Thanked: 25 times
GMAT Score:750+

by VP_Tatiana » Sat May 10, 2008 5:46 pm
Your equation looks great! Now you just need to solve for x....

We start with:

0.6*7 + (x-7)*0.06 = 0.08*x

Multiply out to get:

4.2 + 0.06x - 0.42 = 0.08x

Combine like terms:

3.78 = 0.02x

Multiply everything by 100:

378=2x

Divide by 2:

189 = x

So, the calls cost the same when you talk for 189 minutes.

Best wishes,

Tatiana
Tatiana Becker | GMAT Instructor | Veritas Prep
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Junior | Next Rank: 30 Posts
Posts: 12
Joined: Tue Apr 29, 2008 8:10 pm

Thank you But...there is not answer of 189...

by maya2008 » Sat May 10, 2008 7:30 pm
Thank you Tatiana... I got 189 also...
I forgot to post the answers:
A)2 B)9 C)15 D)21 E)30
and the correct answer btw is: B)9
is that weird or am I missing something?

:?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 189
Joined: Thu May 01, 2008 10:55 pmFollowed by: 1 member
Location: Seattle, WA
Thanked: 25 times
GMAT Score:750+

by VP_Tatiana » Sat May 10, 2008 8:55 pm
It seems that the answer choices do not correspond to this problem. If you plug in 9 to your algebraic expression, you do not get an equality.

Best wishes,

Tatiana
Tatiana Becker | GMAT Instructor | Veritas Prep
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Newbie | Next Rank: 10 Posts
Posts: 6
Joined: Mon Apr 14, 2008 6:26 am
Thanked: 2 times

by Luca80 » Sun May 11, 2008 2:13 am
read carefully the text

A certain phone company offers two plans A and B. Under plan A, the company charges a total of 0.6 for the first 7 min. of each call and $0.06 per minute thereafter...

so the equation is, in cents

60 + (t-7) * 6 =8t

answer 9

ciao
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Junior | Next Rank: 30 Posts
Posts: 12
Joined: Tue Apr 29, 2008 8:10 pm

ohhhh

by maya2008 » Sun May 11, 2008 2:48 am
Tricky...:-) Thank You For Enlightening Me
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 1169
Joined: Sun Jul 06, 2008 2:34 amFollowed by: 1 member
Thanked: 25 times

by aj5105 » Thu Oct 02, 2008 12:39 pm
0.60 + 0.06 T -0.42 = .08T

T= 9
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 1169
Joined: Sun Jul 06, 2008 2:34 amFollowed by: 1 member
Thanked: 25 times

by aj5105 » Thu Oct 02, 2008 12:39 pm
0.60 + 0.06 T -0.42 = .08T

T= 9
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 108
Joined: Sun Mar 15, 2009 2:04 pm

by alexdallas » Sat Jul 04, 2009 8:24 am
wowww

now thats a tricky one :)
i was puzzled too

tks guys
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 527
Joined: Thu May 01, 2008 12:06 am
Thanked: 7 times

Re: GMAT PREP....

by real2008 » Sun Jul 05, 2009 9:27 am
maya2008 wrote:Hey guys,

This question seems easy but from some reason I couldn't solve it...plz help

A certain phone company offers two plans A and B. Under plan A, the company charges a total of 0.6 for the first 7 min. of each call and $0.06 per minute thereafter. Under plan B the company charges $0.08 per minute of each call. what is the duration of call, in minutes, for which the company charges the same amount under plan A and under plan B?

I got this equation:
0.6*7 + (x-7)*0.06 = 0.08*x

that is probably a mistake....right?
yeah! it is.

For option a: for x mins total cost= 0.6+(x-7)*0.06 [where, x>=7]
For option b: for x mins total cost= 0.08*x

now 0.6+(x-7)*0.06=0.08*x

solve it.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 148
Joined: Wed Jun 03, 2009 8:04 pmFollowed by: 1 member
Thanked: 18 times

by ghacker » Sun Jul 05, 2009 12:01 pm
This is a very very simple question

The answer is 9 min

If one reads the stimulus , one can see that plan A charges $ 0.6 of the 1st 7 min and plan B charges $0.08 per min since 0.6 is not divisible by 0.08

we know that the time is greater than 7 min

the value which is common to both plan A and Plan B is 0.72

Plan A ------> 0.6+0.06*2 =0.72 ( 9 mins )

Plan B ---------> 0.08*9 = 0.72
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 93
Joined: Thu Apr 10, 2008 1:42 pm
Location: Chicago
Thanked: 20 times

by Musiq » Mon Jul 06, 2009 7:39 pm
ghacker wrote:This is a very very simple question

The answer is 9 min

If one reads the stimulus , one can see that plan A charges $ 0.6 of the 1st 7 min and plan B charges $0.08 per min since 0.6 is not divisible by 0.08

we know that the time is greater than 7 min

the value which is common to both plan A and Plan B is 0.72

Plan A ------> 0.6+0.06*2 =0.72 ( 9 mins )

Plan B ---------> 0.08*9 = 0.72
Ghacker; it's really counter-productive to the spirit of this website to keep saying "This question is very very simple" all the time.

This question is very very simple for "you"; but for folks preparing for this test it may be disheartening to hear that.

You are a great contributor to this board; I hope you can change the tone of your posts to more encouraging than pedantic.

Sincerely,
Musiq
For love, not money.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 986
Joined: Wed Dec 20, 2006 11:07 amFollowed by: 1 member
Location: India
Thanked: 51 times

by gabriel » Mon Jul 06, 2009 7:50 pm
I agree with Musiq.

For anyone practising the GMAT to read that they could not solve "a very very simple question" is quite dissappointing.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1