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 + (x7)*0.06 = 0.08*x
that is probably a mistake....right?
GMAT PREP....
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 VP_Tatiana
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Your equation looks great! Now you just need to solve for x....
We start with:
0.6*7 + (x7)*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
We start with:
0.6*7 + (x7)*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
 VP_Tatiana
 GMAT Instructor
 Posts: 189
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 Location: Seattle, WA
 Thanked: 25 times
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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
Best wishes,
Tatiana
Tatiana Becker  GMAT Instructor  Veritas Prep
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 + (t7) * 6 =8t
answer 9
ciao
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 + (t7) * 6 =8t
answer 9
ciao

 Master  Next Rank: 500 Posts
 Posts: 108
 Joined: 15 Mar 2009
yeah! it is.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 + (x7)*0.06 = 0.08*x
that is probably a mistake....right?
For option a: for x mins total cost= 0.6+(x7)*0.06 [where, x>=7]
For option b: for x mins total cost= 0.08*x
now 0.6+(x7)*0.06=0.08*x
solve it.

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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
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

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Ghacker; it's really counterproductive to the spirit of this website to keep saying "This question is very very simple" all the time.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
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.